A cluster-approach-based three-camera digital image correlation (DIC) system is introduced for full-field 3D shape and motion measurement. In this system, three cameras are employed to measure the same specimen area at different viewing angles. Data points within the region of interest can be evaluated by arbitrary camera pairs as a stereo DIC system so that data points with the smallest 3D residuum are selected and mapped into one common coordinate system. Two stationary shape measurements and one out-of-plane motion measurement were carried out with the three-camera DIC system. Test results were analyzed based on the same image series, projection calibration, and correlation parameters, but compared using different camera combinations (i.e., three-camera and two-camera data). Three-camera test results show not only an improved surface coverage due to the additional camera viewing angle for uneven specimen surfaces, but also a smaller and more homogenous distributed measurement uncertainty compared to the two-camera test results. The selection of data points with the smallest 3D residuum evaluated from any arbitrary camera pairs enables a better tolerance of the three-camera DIC system against various measurement error sources such as limited depth of field, lens distortion, and speckle pattern distortion due to tilted camera viewing angles.
{"title":"A Three-Camera Digital Image Correlation System For Full-Field 3D Shape and Motion Measurement","authors":"L. Luan, Liam Crosbie","doi":"10.32548/2022.me-04293","DOIUrl":"https://doi.org/10.32548/2022.me-04293","url":null,"abstract":"A cluster-approach-based three-camera digital image correlation (DIC) system is introduced for full-field 3D shape and motion measurement. In this system, three cameras are employed to measure the same specimen area at different viewing angles. Data points within the region of interest can be evaluated by arbitrary camera pairs as a stereo DIC system so that data points with the smallest 3D residuum are selected and mapped into one common coordinate system. Two stationary shape measurements and one out-of-plane motion measurement were carried out with the three-camera DIC system. Test results were analyzed based on the same image series, projection calibration, and correlation parameters, but compared using different camera combinations (i.e., three-camera and two-camera data). Three-camera test results show not only an improved surface coverage due to the additional camera viewing angle for uneven specimen surfaces, but also a smaller and more homogenous distributed measurement uncertainty compared to the two-camera test results. The selection of data points with the smallest 3D residuum evaluated from any arbitrary camera pairs enables a better tolerance of the three-camera DIC system against various measurement error sources such as limited depth of field, lens distortion, and speckle pattern distortion due to tilted camera viewing angles.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44061797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Advancements in nondestructive evaluation (NDE) have represented a continuous process of technology achievements moving toward easier approaches, a wider range of applications, and better results outcomes. Materials and component characterization is done in many instances using destructive testing, which is effective but time-consuming, costly, and difficult to obtain feedback during manufacturing. Today, new, efficient, and noninvasive materials characterization technologies are becoming standard in industry, offering cost-effective applicability and quality benefits. In addition, newer inventions, state-of-the-art methodologies and instrumentations in NDE, and characterization technologies are offering ample support to industry to advance work and operations.
{"title":"Digital Image Correlation and Its Role in NDE","authors":"A. Abdul-Aziz","doi":"10.32548/2022.me-04306","DOIUrl":"https://doi.org/10.32548/2022.me-04306","url":null,"abstract":"Advancements in nondestructive evaluation (NDE) have represented a continuous process of technology achievements moving toward easier approaches, a wider range of applications, and better results outcomes. Materials and component characterization is done in many instances using destructive testing, which is effective but time-consuming, costly, and difficult to obtain feedback during manufacturing. Today, new, efficient, and noninvasive materials characterization technologies are becoming standard in industry, offering cost-effective applicability and quality benefits. In addition, newer inventions, state-of-the-art methodologies and instrumentations in NDE, and characterization technologies are offering ample support to industry to advance work and operations.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49164064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Traditional nondestructive evaluation (NDE) methods present significant challenges to detecting and characterizing kissing or weak bonds in adhesively bonded structures. These kissing or weak bonds also cannot transmit shear stresses or handle complex loading modes and, if not detected, can present a significant threat to the structural integrity of the components or systems. This paper demonstrates the digital image correlation (DIC) technique for evaluating adhesively bonded dissimilar materials joints subjected to kissing or weak bonds. The study employed four adhesively bonded carbon fiber reinforced plastics and aluminum (CFRP-Al) lap-shear test coupons with varied bond quality (i.e., with no contamination and three simulated kissing bond defects). The novelty of the approach presented in this paper was that this technique could detect and demonstrate changes in the normal strain (εyy) contour map of the contaminated specimens at relatively lower load levels. This load level corresponds to 15% of the failure load for the silicone and hydraulic oil contaminated sample and around 30% for the polyvinyl alcohol (PVA) contaminated sample. In addition, higher compressive strains along the overlap edges were observed in the strain map for the single lap joints due to the higher peeling stresses of the adherend and the stress concentration at the edges of an adhesively bonded joint.
{"title":"Assessment of Composite Aluminum Adhesive Joints Using Digital Image Correlation","authors":"Anish Poudel, T. Chu","doi":"10.32548/2022.me-04281","DOIUrl":"https://doi.org/10.32548/2022.me-04281","url":null,"abstract":"Traditional nondestructive evaluation (NDE) methods present significant challenges to detecting and characterizing kissing or weak bonds in adhesively bonded structures. These kissing or weak bonds also cannot transmit shear stresses or handle complex loading modes and, if not detected, can present a significant threat to the structural integrity of the components or systems. This paper demonstrates the digital image correlation (DIC) technique for evaluating adhesively bonded dissimilar materials joints subjected to kissing or weak bonds. The study employed four adhesively bonded carbon fiber reinforced plastics and aluminum (CFRP-Al) lap-shear test coupons with varied bond quality (i.e., with no contamination and three simulated kissing bond defects). The novelty of the approach presented in this paper was that this technique could detect and demonstrate changes in the normal strain (εyy) contour map of the contaminated specimens at relatively lower load levels. This load level corresponds to 15% of the failure load for the silicone and hydraulic oil contaminated sample and around 30% for the polyvinyl alcohol (PVA) contaminated sample. In addition, higher compressive strains along the overlap edges were observed in the strain map for the single lap joints due to the higher peeling stresses of the adherend and the stress concentration at the edges of an adhesively bonded joint.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48149871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
It is often stated that no two engineers will set up an industrial X-ray computed tomography (CT) scan with the same parameters. In this article, an orderly set of steps is presented that will lead to an acceptable CT scan result for typical cone beam (volumetric) systems with application to denser and/or larger objects. This approach can be applied when using minifocus, mesofocus, and microfocus X-ray tubes. The strategy covers preparation and general considerations, selection of the proper tube and detector, methods to determine the proper magnification, setting X-ray tube and detector parameters, considerations to achieve good image quality, and common mistakes to avoid.
{"title":"Industrial Computed Tomography Technique Development for Industrial Volumetric X-Ray CT","authors":"D. Roth","doi":"10.32548/2022.me-04291","DOIUrl":"https://doi.org/10.32548/2022.me-04291","url":null,"abstract":"It is often stated that no two engineers will set up an industrial X-ray computed tomography (CT) scan with the same parameters. In this article, an orderly set of steps is presented that will lead to an acceptable CT scan result for typical cone beam (volumetric) systems with application to denser and/or larger objects. This approach can be applied when using minifocus, mesofocus, and microfocus X-ray tubes. The strategy covers preparation and general considerations, selection of the proper tube and detector, methods to determine the proper magnification, setting X-ray tube and detector parameters, considerations to achieve good image quality, and common mistakes to avoid.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46146688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sina Mehdinia, K. S. T. Chopperla, A. Hafiz, T. Schumacher, J. Ideker
Alkali-silica reaction (ASR) is a deleterious reaction in concrete that leads to the expansion and cracking of concrete. Laboratory approaches to monitor concrete for ASR activity are often lengthy and depend on an operator for regular measurements. The aim of this research is to develop an automated and reliable monitoring approach based on ultrasonic coda (or diffuse) wavefields, which are highly sensitive to minute and slowly occurring changes in a material—ideal for ASR. In this paper, the proposed approachis introduced along with an experimental study that compares ultrasonic coda wave monitoring data with traditional expansion measurements following ASTM C1293. A simple, fast, and robust algorithm to track a selected coda wave feature is proposed and evaluated and was applied to the recorded data. The monitored concrete prisms were designed to have three different levels of ASR activity by varying the lithium admixture dosage. The proposed approach was found to be promising. The process is automated and the monitoring of the specimens using coda wavefields was able to clearly differentiate the mixtures with varying ASR expansions.
{"title":"Ultrasonic Coda Wave Monitoring of Alkali-Silica Reactivity in Concrete Laboratory Prisms","authors":"Sina Mehdinia, K. S. T. Chopperla, A. Hafiz, T. Schumacher, J. Ideker","doi":"10.32548/2022.me-04248","DOIUrl":"https://doi.org/10.32548/2022.me-04248","url":null,"abstract":"Alkali-silica reaction (ASR) is a deleterious reaction in concrete that leads to the expansion and cracking of concrete. Laboratory approaches to monitor concrete for ASR activity are often lengthy and depend on an operator for regular measurements. The aim of this research is to develop an automated and reliable monitoring approach based on ultrasonic coda (or diffuse) wavefields, which are highly sensitive to minute and slowly occurring changes in a material—ideal for ASR. In this paper, the proposed approachis introduced along with an experimental study that compares ultrasonic coda wave monitoring data with traditional expansion measurements following ASTM C1293. A simple, fast, and robust algorithm to track a selected coda wave feature is proposed and evaluated and was applied to the recorded data. The monitored concrete prisms were designed to have three different levels of ASR activity by varying the lithium admixture dosage. The proposed approach was found to be promising. The process is automated and the monitoring of the specimens using coda wavefields was able to clearly differentiate the mixtures with varying ASR expansions.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42719440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Zheng, Ze Li, Songfeng Liu, Hao Dong, Feng Hao, Feng Hu, Yuanchao Bao
In this paper, a cylindrical aluminum specimen with an eccentric circular hole is prepared and ultrasonic measurements are carried out by experimental means. The measurement area is restricted to the plane perpendicular to the axis of the cylindrical component. The measured wave data are fed into the approximate correction method formula—the Born inversion procedure—and cross-sectional images are obtained. Next, a 3D shape reconstruction of the defect in the aluminum specimen is performed by stacking the cross-sectional images. After correcting the defect’s echo amplitude, the defect reconstruction effect of the 2D section and 3D defect reconstruction effect improves remarkably.
{"title":"Born-Inversion Procedure for Shape Reconstruction of Eccentric Defects in Cylindrical Components","authors":"G. Zheng, Ze Li, Songfeng Liu, Hao Dong, Feng Hao, Feng Hu, Yuanchao Bao","doi":"10.32548/2022.me-04280","DOIUrl":"https://doi.org/10.32548/2022.me-04280","url":null,"abstract":"In this paper, a cylindrical aluminum specimen with an eccentric circular hole is prepared and ultrasonic measurements are carried out by experimental means. The measurement area is restricted to the plane perpendicular to the axis of the cylindrical component. The measured wave data are fed into the approximate correction method formula—the Born inversion procedure—and cross-sectional images are obtained. Next, a 3D shape reconstruction of the defect in the aluminum specimen is performed by stacking the cross-sectional images. After correcting the defect’s echo amplitude, the defect reconstruction effect of the 2D section and 3D defect reconstruction effect improves remarkably.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48987982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.32548/10.32548/2022.me-04282
Zenghua Liu, Runxin Man, Kexin Wang, Yuheng Wu
Structural coatings are widely used because of their excellent mechanical and thermal properties. To evaluate defects and uniformity in coatings, both qualitatively and quantitatively, a terahertz time-domain spectroscopy (THz-TDS) detection technique is proposed. The thermal barrier coating is selected as a typical single-layer coating structure for quantitative defect detection. A wavelet noise reduction method is used on the acquired raw signals to eliminate noise while retaining detailed information. The peak value of the preprocessed signal is used as a feature parameter for imaging, and the automatic binarization threshold segmentation technique is used to describe the defects quantitatively. The automotive coating is selected as a typical multilayer coating structure for uniformity detection. The time-frequency characteristics of a strongly superimposed signal are analyzed; the peak-to-peak value is used as a feature parameter for imaging, and the peak-to-peak 3D imaging is then used to characterize the coating uniformity, enabling fast and intuitive acquisition of the coating state. The statistical characteristics of the standard deviation and range are used to evaluate the uniformity of each layer of the automotive coating. The results show that the uniformity of the clean coating is optimal. The results of a subsequent thickness inspection using an eddy current gauge are consistent with those of the terahertz technique. The results demonstrate that THz-TDS can effectively detect defects and uniformity in coatings.
{"title":"Nondestructive Evaluation of Coating Defects and Uniformity Based on Terahertz Time-Domain Spectroscopy","authors":"Zenghua Liu, Runxin Man, Kexin Wang, Yuheng Wu","doi":"10.32548/10.32548/2022.me-04282","DOIUrl":"https://doi.org/10.32548/10.32548/2022.me-04282","url":null,"abstract":"Structural coatings are widely used because of their excellent mechanical and thermal properties. To evaluate defects and uniformity in coatings, both qualitatively and quantitatively, a terahertz time-domain spectroscopy (THz-TDS) detection technique is proposed. The thermal barrier coating is selected as a typical single-layer coating structure for quantitative defect detection. A wavelet noise reduction method is used on the acquired raw signals to eliminate noise while retaining detailed information. The peak value of the preprocessed signal is used as a feature parameter for imaging, and the automatic binarization threshold segmentation technique is used to describe the defects quantitatively. The automotive coating is selected as a typical multilayer coating structure for uniformity detection. The time-frequency characteristics of a strongly superimposed signal are analyzed; the peak-to-peak value is used as a feature parameter for imaging, and the peak-to-peak 3D imaging is then used to characterize the coating uniformity, enabling fast and intuitive acquisition of the coating state. The statistical characteristics of the standard deviation and range are used to evaluate the uniformity of each layer of the automotive coating. The results show that the uniformity of the clean coating is optimal. The results of a subsequent thickness inspection using an eddy current gauge are consistent with those of the terahertz technique. The results demonstrate that THz-TDS can effectively detect defects and uniformity in coatings.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46211085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.32548/2022.me-80-09-27-30
Sam Cunningham, A. Schofield
In 2014, a UK government report identified a dire need for skilled workers in the nondestructive testing (NDT) industry, and the seeds of a government-funded apprenticeship program to address the skills gap was born. In partnership with the British Institute of Nondestructive Testing (BINDT), an industry-led employer group worked to develop three NDT apprenticeship training programs, incorporating varying levels of industrial qualifications, behaviors, and skill sets, to great success. At the last count, more than 260 apprentices had started their NDT apprenticeship.
{"title":"NDT Apprenticeship in the UK","authors":"Sam Cunningham, A. Schofield","doi":"10.32548/2022.me-80-09-27-30","DOIUrl":"https://doi.org/10.32548/2022.me-80-09-27-30","url":null,"abstract":"In 2014, a UK government report identified a dire need for skilled workers in the nondestructive testing (NDT) industry, and the seeds of a government-funded apprenticeship program to address the skills gap was born. In partnership with the British Institute of Nondestructive Testing (BINDT), an industry-led employer group worked to develop three NDT apprenticeship training programs, incorporating varying levels of industrial qualifications, behaviors, and skill sets, to great success. At the last count, more than 260 apprentices had started their NDT apprenticeship.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45164422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.32548/10.32548/2022.me-04229
M. Sheykholeslami, M. Allahdadi, M. Zeighami, M. Ghodsi
The mechanical properties of ferromagnetic materials change when the magnetization level of these materials changes. This phenomenon occurs due to magnetostriction. The change in direction of the magnetic domains is the reason for magnetostriction. In this paper, we hypothesize that the amount of acoustic attenuation in ferromagnetic materials depends on their magnetization level. To prove this hypothesis, a numerical approach is employed and the results compared to previous results in the literature. Permendur, an iron-cobalt alloy that exhibits a large magnetostriction effect, is used for the simulation. The results of the numerical study show that ultrasonic reflection and transmission coefficients in Permendur change in response to changes in the external magnetic field. A comparison between these numerical results and experimental results in the literature allows us to determine the changes in acoustic attenuation due to the magnetic field. The results show that there is an increasing trend at first, and then a decreasing trend, between acoustic absorption attenuation and increasing external magnetic field. This approach would be useful in ultrasonic testing of ferromagnetic materials when the reflected echoes are not detectable due to attenuation.The mechanical properties of ferromagnetic materials change when the magnetization level of these materials changes. This phenomenon occurs due to magnetostriction. The change in direction of the magnetic domains is the reason for magnetostriction. In this paper, we hypothesize that the amount of acoustic attenuation in ferromagnetic materials depends on their magnetization level. To prove this hypothesis, a numerical approach is employed and the results compared to previous results in the literature. Permendur, an iron-cobalt alloy that exhibits a large magnetostriction effect, is used for the simulation. The results of the numerical study show that ultrasonic reflection and transmission coefficients in Permendur change in response to changes in the external magnetic field. A comparison between these numerical results and experimental results in the literature allows us to determine the changes in acoustic attenuation due to the magnetic field. The results show that there is an increasing trend at first, and then a decreasing trend, between acoustic absorption attenuation and increasing external magnetic field. This approach would be useful in ultrasonic testing of ferromagnetic materials when the reflected echoes are not detectable due to attenuation.
{"title":"Study of Acoustic Attenuation Trends in Permendur 49 Magnetostrictive Material","authors":"M. Sheykholeslami, M. Allahdadi, M. Zeighami, M. Ghodsi","doi":"10.32548/10.32548/2022.me-04229","DOIUrl":"https://doi.org/10.32548/10.32548/2022.me-04229","url":null,"abstract":"The mechanical properties of ferromagnetic materials change when the magnetization level of these materials changes. This phenomenon occurs due to magnetostriction. The change in direction of the magnetic domains is the reason for magnetostriction. In this paper, we hypothesize that the amount of acoustic attenuation in ferromagnetic materials depends on their magnetization level. To prove this hypothesis, a numerical approach is employed and the results compared to previous results in the literature. Permendur, an iron-cobalt alloy that exhibits a large magnetostriction effect, is used for the simulation. The results of the numerical study show that ultrasonic reflection and transmission coefficients in Permendur change in response to changes in the external magnetic field. A comparison between these numerical results and experimental results in the literature allows us to determine the changes in acoustic attenuation due to the magnetic field. The results show that there is an increasing trend at first, and then a decreasing trend, between acoustic absorption attenuation and increasing external magnetic field. This approach would be useful in ultrasonic testing of ferromagnetic materials when the reflected echoes are not detectable due to attenuation.The mechanical properties of ferromagnetic materials change when the magnetization level of these materials changes. This phenomenon occurs due to magnetostriction. The change in direction of the magnetic domains is the reason for magnetostriction. In this paper, we hypothesize that the amount of acoustic attenuation in ferromagnetic materials depends on their magnetization level. To prove this hypothesis, a numerical approach is employed and the results compared to previous results in the literature. Permendur, an iron-cobalt alloy that exhibits a large magnetostriction effect, is used for the simulation. The results of the numerical study show that ultrasonic reflection and transmission coefficients in Permendur change in response to changes in the external magnetic field. A comparison between these numerical results and experimental results in the literature allows us to determine the changes in acoustic attenuation due to the magnetic field. The results show that there is an increasing trend at first, and then a decreasing trend, between acoustic absorption attenuation and increasing external magnetic field. This approach would be useful in ultrasonic testing of ferromagnetic materials when the reflected echoes are not detectable due to attenuation.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69698902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chai Jun-Hui, Lv Zhong-Jie, Shen Zheng-Xiang, Zhang Zi-Jiang, Bo Xu, Shen Jian-Min, Qian Sheng-Jie, Y. Fu
Using a nondestructive testing method based on hysteresis behavior, the structural-mechanical dependence of the coercive force of 35CrMo steel components was compared with that of standard specimens. As described in the magnetic Jiles–Atherton model, the magnetic coercive force of the cylinders was inversely proportional to the grain refinement, which was validated by means of metallographic examination and hardness tests. Simultaneously, this study presented an experimental validation by destructive testing for determining the relationship between the measured magnetic parameter and the property of concern and a linear correlation between coercive force and hardness. These observations provide a method to quickly and nondestructively evaluate the mechanical properties of steel components.
{"title":"Magnetic Method for Evaluating Mechanical Properties of Steel Cylinders","authors":"Chai Jun-Hui, Lv Zhong-Jie, Shen Zheng-Xiang, Zhang Zi-Jiang, Bo Xu, Shen Jian-Min, Qian Sheng-Jie, Y. Fu","doi":"10.32548/2022.me-04262","DOIUrl":"https://doi.org/10.32548/2022.me-04262","url":null,"abstract":"Using a nondestructive testing method based on hysteresis behavior, the structural-mechanical dependence of the coercive force of 35CrMo steel components was compared with that of standard specimens. As described in the magnetic Jiles–Atherton model, the magnetic coercive force of the cylinders was inversely proportional to the grain refinement, which was validated by means of metallographic examination and hardness tests. Simultaneously, this study presented an experimental validation by destructive testing for determining the relationship between the measured magnetic parameter and the property of concern and a linear correlation between coercive force and hardness. These observations provide a method to quickly and nondestructively evaluate the mechanical properties of steel components.","PeriodicalId":49876,"journal":{"name":"Materials Evaluation","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48759256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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