Experimental Mechanics最新文献_第2页

Stereo-DICNet2: A Unified and Physics-Guided Speckle Matching Network for Three-Dimensional Deformation Measurement 三维变形测量的统一物理导向散斑匹配网络Stereo-DICNet2

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-11-14 DOI: 10.1007/s11340-025-01241-7

Y. Feng, L. Wang

Background

Stereo Digital Image Correlation (Stereo-DIC) is a non-contact optical three-dimensional measurement technique based on speckle image matching. It enables three-dimensional shape and deformation measurements through inter-frame and inter-camera matching. In recent years, the rapid development of deep learning has had a significant impact on the field of image matching, and there has been increasing attention on using neural networks to enhance the efficiency and accuracy of DIC measurements. However, existing methods face two challenges: First, there is no unified Stereo-DIC network to achieve temporal and stereo matching simultaneously. Second, the black box characteristic of neural networks leads to image matching lacking interpretability, which hinders the wide application and further research of these methods.

Objective

To solve these problems, this paper proposes a unified and physics-guided speckle matching network for Stereo-DIC, referred to as Stereo-DICNet2.

Methods

Stereo-DICNet2 only uses deep learning to extract image features and proposes a feature-based cross-correlation (FCC) matching layer that performs matching through specific mathematical operations rather than a black box. In addition, a lightweight RAFT (Recurrent All-Pairs Field Transforms) iterative optimization algorithm is introduced to optimize the displacement.

Results

Stereo-DICNet2 can achieve micron-level three-dimensional measurement accuracy in material tensile experiments.

Conclusions

The proposed method explicitly integrates deep learning with mathematical operations to address the dual challenges of unified spatiotemporal matching and interpretability limitations, demonstrating high practical value in experimental validations.

背景立体数字图像相关（Stereo-DIC）是一种基于散斑图像匹配的非接触式光学三维测量技术。它可以通过帧间和相机间匹配实现三维形状和变形测量。近年来，深度学习的快速发展对图像匹配领域产生了重大影响，利用神经网络提高DIC测量的效率和精度越来越受到人们的关注。然而，现有的方法面临两个挑战：一是没有统一的stereo - dic网络来同时实现时间和立体匹配。其次，神经网络的黑箱特性导致图像匹配缺乏可解释性，阻碍了这些方法的广泛应用和进一步研究。目的针对这些问题，提出了一种统一的、物理导向的Stereo-DIC散斑匹配网络，称为Stereo-DICNet2。方法stereo - dicnet2仅利用深度学习提取图像特征，并提出了一种基于特征的相互关联（FCC）匹配层，该层通过特定的数学运算而不是黑盒进行匹配。此外，还引入了一种轻量级的RAFT （Recurrent All-Pairs Field Transforms）迭代优化算法来优化位移。结果stereo - dicnet2在材料拉伸实验中可以达到微米级的三维测量精度。结论该方法明确地将深度学习与数学运算相结合，解决了统一时空匹配和可解释性限制的双重挑战，在实验验证中具有较高的实用价值。

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引用次数: 0

Monitoring of Thermal and Deformation Fields of a Textile Subjected to Modulated Quasi-Static Tensile Test Using a Thermal Camera 用热像仪监测调制准静态拉伸试验织物的热变形场

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-11-12 DOI: 10.1007/s11340-025-01247-1

M. Hussein, D. Mathieu, G. L’hostis, B. Durand

Background

The mechanical behavior of textiles is highly dependent on their anisotropic and viscoelastic nature, necessitating advanced characterization techniques to capture both thermal and mechanical responses accurately. Conventional tensile tests often fail to provide sufficient insights into textiles' dynamic and heterogeneous behavior, particularly regarding dynamic stiffness evolution, energy dissipation, and structural integrity.

Objective

This study investigates the use of thermal imaging combined with digital image correlation (DIC) to measure displacement fields and deformation, thereby enabling a more comprehensive assessment of textile mechanics under modulated quasi-static tensile loading.

Methods

A textile specimen was subjected to a modulated quasi-static tensile test, where cyclic loading was superimposed on a quasi-static tensile strain. Infrared thermography was employed to monitor displacement fields and temperature variations, enabling the statistical analysis of deformation homogeneity, local stress evolution, and heat source localization. The complex modulus was analyzed to evaluate the fabric’s viscoelastic behavior.

Results

The proposed methodology successfully quantified displacement fields and revealed significant heterogeneities in textile deformation, especially between the warp and weft directions. The addition of modulation highlighted the fabric’s viscoelastic properties, with a notable increase in dynamic stiffness beyond 45% strain. DIC analysis directly on thermal images simplified data processing, enabling the identification of heat sources in terms of amplitude and location. This approach also facilitated the quantification of structural transformations.

Conclusions

This study demonstrates that thermal imaging can effectively capture both deformation and thermal fields, providing a robust method for textile characterization. Integrating a modulated quasi-static tensile test with thermal analysis enhances the understanding of textile mechanics. It offers a valuable framework for optimizing high-performance textiles across various applications.

纺织品的力学行为高度依赖于它们的各向异性和粘弹性，因此需要先进的表征技术来准确地捕捉热响应和力学响应。传统的拉伸试验往往不能提供足够的洞察纺织品的动态和非均质行为，特别是关于动态刚度演变，能量耗散和结构完整性。目的利用热成像技术结合数字图像相关技术（DIC）测量纺织品的位移场和变形，从而更全面地评估纺织品在调制准静态拉伸载荷下的力学性能。方法采用准静态拉伸应变叠加循环载荷的调制拟静态拉伸试验。利用红外热像仪监测位移场和温度变化，对变形均匀性、局部应力演化和热源局部化进行统计分析。利用复模量分析织物的粘弹性。结果所提出的方法成功地量化了位移场，揭示了纺织品变形的显著异质性，特别是经纬方向之间的异质性。调制的加入突出了织物的粘弹性，动态刚度显著增加，超过45%的应变。直接对热图像进行DIC分析简化了数据处理，使热源的振幅和位置识别成为可能。这种方法也促进了结构转换的量化。本研究表明，热成像可以有效地捕获变形场和热场，为纺织品表征提供了一种可靠的方法。将调制准静态拉伸试验与热分析相结合，提高了对纺织力学的理解。它为跨各种应用优化高性能纺织品提供了一个有价值的框架。

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引用次数: 0

DIC-Based Finite Element Model Validation: A Practical Case Study for In-Plane Loading of A Composite Laminate 基于dic的有限元模型验证：复合材料层合板面内载荷的实例研究

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-11-12 DOI: 10.1007/s11340-025-01234-6

A. Peshave, F. Pierron, P. Lava, D. Moens, D. Vandepitte

Background

Digital image correlation (DIC) measured heterogeneous deformation fields promise enhanced validation of finite element (FE) models. In the existing literature, DIC-based FE model validation is commonly performed in a qualitative way based on visual appraisal of FE-DIC likeness of deformation fields. Moreover, DIC uncertainties are usually inadequately characterised.

Objective

This paper aims to take a step towards a quantitative approach by experimentally validating an enhanced DIC uncertainty quantification (UQ) procedure previously proposed by the authors.

Methods

Heterogeneous strain fields in a composite notched test sample were measured using DIC. DIC bias errors were accounted for through a numerical speckle deformation based digital twin (DT) of the DIC experiment. Heterogeneous DIC noise maps were used to formulate a fully-spatial model validation criterion. Careful test design choices were made to minimise the modelling errors originating from constitutive behaviour. Extensive investigation into the validity of the constitutive model was performed to justify the validation errors.

Results

The UQ approach, together with the application of DIC-measured boundary conditions in the FE model were found to be essential for proper validation. Decrease in the tangent modulus of the composite material caused by the accumulation of damage in the composite matrix was confirmed by cyclic tests. The FE constitutive model did not account for composite damage, resulting in validation errors consistent with these limitations.

Conclusions

The DIC-based FE model validation approach was proven to be effective when a specific protocol is followed.

数字图像相关（DIC）测量的非均匀变形场有望增强有限元（FE）模型的有效性。在现有文献中，基于dic的有限元模型验证通常是基于视觉评价变形场FE- dic相似性的定性方法。此外，DIC不确定性通常没有得到充分表征。本文旨在通过实验验证作者先前提出的增强型DIC不确定度量化（UQ）程序，向定量方法迈出一步。方法采用DIC法测量复合材料缺口试样的非均质应变场。通过基于散斑变形的DIC实验数字孪生（DT）计算了DIC偏置误差。异质DIC噪声图用于制定全空间模型验证标准。仔细的试验设计选择是为了尽量减少由本构行为产生的建模误差。对本构模型的有效性进行了广泛的调查，以证明验证错误。结果发现UQ方法以及在有限元模型中应用dic测量的边界条件对于正确验证是必不可少的。循环试验证实了复合材料的切模量下降是由于复合材料基体中损伤的累积引起的。有限元本构模型没有考虑复合材料损伤，导致验证误差与这些限制一致。结论当遵循特定的治疗方案时，基于dic的FE模型验证方法是有效的。

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引用次数: 0

Experimental Investigation of Shear Behavior in 3D Woven Carbon/Carbon Composites Under Static and Dynamic Loading 三维编织碳/碳复合材料静、动载荷剪切性能试验研究

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-11-12 DOI: 10.1007/s11340-025-01249-z

Q. Gong, S. Zeng, J. Chen, X. Huang

Background

Shear properties are critical to the structural integrity of carbon/carbon (C/C) composites. However, current testing methods primarily focus on quasi-static conditions, leading to a significant gap in understanding the differences in shear behavior under dynamic versus static loading.

Objective

This study aims to develop a novel shear testing method capable of accommodating both dynamic and static loading conditions, utilizing an improved V-notch beam (VNB) fixture integrated with a guide-slider system, and to investigate the shear behavior of three-dimensional woven C/C composites.

Methods

Shear tests were conducted using both a universal testing machine and a high-speed tensile testing system. Digital Image Correlation (DIC), combined with high-speed imaging, was employed to analyze strain distribution and capture the failure process during loading.

Results

The composites exhibited pronounced anisotropy in shear properties, with shear strength and modulus in the XY- direction significantly higher than in the Z-direction. Both properties were highly dependent on strain rate, increasing with higher applied strain rates. Failure modes varied with orientation: fiber pull-out, interfacial debonding, and matrix cracking predominated in the XY- direction, while interlaminar delamination was dominant in the Z-direction. Inertial effects further influenced failure modes under dynamic loading.

Conclusions

The newly developed VNB fixture significantly enhances the accuracy and reliability of shear testing for three-dimensionally woven C/C composites. The results highlight the anisotropic and strain-rate-sensitive shear behavior, which is closely linked to the material’s microstructure and failure mechanisms under different loading conditions.

剪切性能对碳/碳（C/C）复合材料的结构完整性至关重要。然而，目前的测试方法主要集中在准静态条件下，导致在了解动态和静态载荷下剪切行为的差异方面存在很大差距。目的利用改进的v形缺口梁（VNB）夹具与导轨滑块系统集成，开发一种能够适应动、静载荷条件的剪切试验方法，研究三维编织C/C复合材料的剪切性能。方法采用万能试验机和高速拉伸试验系统进行剪切试验。采用数字图像相关（DIC）技术，结合高速成像技术，分析了加载过程中的应变分布，捕捉了加载过程中的破坏过程。结果复合材料的抗剪性能表现出明显的各向异性，XY方向的抗剪强度和模量显著高于z方向。这两种性能都高度依赖于应变率，随应变率的增加而增加。破坏模式随取向不同而不同，XY方向上以纤维拔出、界面脱粘和基体开裂为主，z方向上以层间脱粘为主。惯性效应进一步影响动载荷作用下的失效模式。结论新研制的VNB夹具显著提高了三维编织C/C复合材料剪切测试的准确性和可靠性。结果表明，不同加载条件下材料的各向异性和应变率敏感剪切行为与材料的微观结构和破坏机制密切相关。

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引用次数: 0

Influence of Steel Fibers on the Hysteretic Response of Reinforced Concrete Beams with Detailed Strain Monitoring 钢纤维对钢筋混凝土梁滞回响应的影响及应变监测

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-11-06 DOI: 10.1007/s11340-025-01248-0

E. E. Espino-Robles, J. H. Chávez-Gómez, M. Mesa-Lavista, F. A. Carpio-Santamaría, J. Álvarez-Pérez

Background

The seismic performance of reinforced concrete (RC) beams remains a critical research area due to the need for improved ductility and energy dissipation under cyclic loads. Traditional reinforcement strategies are often insufficient to control crack propagation and post-yield behavior, especially under large deformations.

Objective

This study evaluates the effectiveness of steel fiber inclusion in RC beams subjected to cyclic loading, focusing on performance enhancement without reducing conventional reinforcement, as well as methodological refinement in experimental testing.

Methods

Full-scale beam-column joints were tested under displacement-controlled cyclic loading. Steel fibers were added at a 0.7% volume fraction to selected specimens, while conventional reinforcement remained unchanged. Advanced instrumentation, including strain gauges and Digital Image Correlation (DIC), was employed to capture crack development, strain evolution, and stiffness degradation. Special attention was given to the experimental configuration, which was optimized to ensure boundary condition stability and accurate measurements.

Results

Fiber-reinforced specimens exhibited enhanced energy dissipation (24.57%), improved stiffness (18.36%), and delayed damage progression, compared to non-fiber specimens. Strain analyses indicated delayed yielding and more gradual post-peak behavior in longitudinal reinforcement, while transverse bars remained elastic in fiber-reinforced beams. The DIC method successfully captured crack evolution, though its effectiveness decreased at high damage levels.

Conclusions

The results confirm that even a minimal fiber dosage can yield measurable structural benefits, improving post-yield behavior, crack control, and residual capacity. Beyond material effects, this study also contributes to experimental methodology, including test setup refinement and full-field strain monitoring. The results offer valuable mechanistic insight into the seismic response of fiber-reinforced beams.

钢筋混凝土（RC）梁的抗震性能一直是一个重要的研究领域，因为需要提高循环荷载下的延性和能量耗散。传统的加固策略往往不足以控制裂纹扩展和屈服后行为，特别是在大变形下。目的：本研究评估钢筋混凝土梁在循环荷载作用下的钢纤维包裹体的有效性，重点关注在不减少常规钢筋的情况下提高性能，以及改进实验测试方法。方法采用位移控制循环荷载对梁柱节点进行全尺寸试验。在所选试样中加入0.7%体积分数的钢纤维，而常规增强材料保持不变。包括应变计和数字图像相关（DIC）在内的先进仪器被用来捕捉裂纹发展、应变演化和刚度退化。对实验配置进行了优化，以确保边界条件的稳定性和测量的准确性。结果与非纤维试件相比，纤维增强试件的能量耗散增强（24.57%），刚度改善（18.36%），损伤进展延迟。应变分析表明，纵向钢筋的屈服延迟和峰后行为更加缓慢，而横向钢筋在纤维增强梁中保持弹性。DIC方法成功地捕获了裂纹的演化过程，但其有效性在高损伤水平下有所下降。结果证实，即使是最小纤维用量也能产生可测量的结构效益，改善屈服后性能、裂缝控制和剩余容量。除了材料效应，本研究还对实验方法做出了贡献，包括测试装置的改进和全场应变监测。这些结果为纤维增强梁的地震反应提供了有价值的力学见解。

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引用次数: 0

Advanced Algorithms of Mitigating Undermatched Systematic Error in DIC 降低DIC中欠匹配系统误差的高级算法

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-11-04 DOI: 10.1007/s11340-025-01238-2

J. Hu, H. Miao, J. Xu, R. Zhang, L. Lai, Y. Deng

Background

In complex deformation measurements, systematic errors caused by undermatched shape functions are the primary source of errors in Digital Image Correlation (DIC). There are two important ones among the current undermatched systematic error mitigation methods, Recovery method and Improved Quasi-Gauss Point (IQGP) method, that have shown effectiveness in mitigating such errors, though each has its own inherent limitations. The Recovery method is derived based on first-order shape function, while the IQGP method is setup under the assumption of the second-order displacement field in subset.

Objective

This study aims to extend and improve both the Recovery method and IQGP method respectively to address these limitations and enhance their applicability while comparing the performance between themselves and with other current methods.

Methods

As for the Recovery method, the effectiveness in mitigating undermatched systematic errors for second-order shape functions is deduced and verified, which broadens its applicability. As for the IQGP method, a new method called Zero-Error Point (ZEP) method is proposed based on the similar principles while accepting the third-order displacement assumption which basically leads to better and wider adaptability compared to the IQGP method. Other classic undermatched systematic error mitigation method and deconvolution method are also involved into analysis and discussion here.

Results

The extended Recovery method can now mitigate the undermatched error of second-order shape functions compare to the original one just for the first-order shape function, and the improved IQGP method based on the third-order displacement field can achieve an accuracy improvement of nearly 0.4 pixels compared to the traditional IQGP according to experiment results.

Conclusion

These advancements enhance the performance of undermatched systematic errors algorithms of DIC, thus improving the ability of DIC in deformation characterization under inhomogeneous deformation.

在复杂变形测量中，形状函数不匹配引起的系统误差是数字图像相关（DIC）测量误差的主要来源。在目前的不匹配系统误差缓解方法中，有两种重要的方法，恢复方法和改进的准高斯点（IQGP）方法，尽管每种方法都有其固有的局限性，但在缓解此类误差方面都显示出有效性。恢复方法是基于一阶形状函数推导的，而IQGP方法是在子集中二阶位移场的假设下建立的。目的对回收率法和IQGP法进行扩展和改进，以解决其局限性，提高其适用性，并与现有方法进行性能比较。方法推导并验证了该方法对二阶形状函数的不匹配系统误差的抑制效果，拓宽了其适用性。对于IQGP方法，基于类似的原理，在接受三阶位移假设的前提下，提出了零误差点（Zero-Error Point， ZEP）方法，该方法的自适应性基本上优于IQGP方法。本文还对其他经典的欠匹配系统误差缓解方法和反卷积方法进行了分析和讨论。结果扩展恢复方法能够较好地缓解二阶形状函数在一阶形状函数上的欠匹配误差，实验结果表明，基于三阶位移场的改进IQGP方法比传统IQGP方法精度提高了近0.4个像素。结论这些进展提高了DIC欠匹配系统误差算法的性能，从而提高了DIC在非均匀变形下的变形表征能力。

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引用次数: 0

Active Anti-Fogging in Transparent Media by Ultrasonic Excitation 超声激发透明介质主动防雾

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-10-30 DOI: 10.1007/s11340-025-01215-9

D. Ruiz-Cadalso, A. Salerni, H. Zheng, J.O. Luiz, D. Ziegler, C. Furlong

Background

Fogging on optical components such as eyeglasses and safety goggles in humid environments can significantly degrade visibility and pose safety risks. While passive anti-fogging methods, such as hydrophobic surface coatings, are commonly used, they are prone to degradation and have limited durability.

Objective

This study investigates a multiphysics approach to actively defog optical surfaces, transparent in the visible wavelength range, using ultrasonic excitation to enhance anti-fogging performance.

Methods

An approach consisting of analytical, computational, and experimental methods is developed to validate the efficacy of ultrasound as an active anti-fogging mechanism. Analytical and computational models provide quantitative insights into the hydrodynamic interactions between micro-droplets and ultrasonic energy, and these are validated by tomographic measurements using Optical Coherence Tomography (OCT). A custom environmental chamber was constructed and instrumented with temperature and humidity control, as well as advanced imaging tools to monitor visibility, surface condensation, thermal behavior, and substrate dynamics using Scanning Laser Doppler Vibrometry (SLDV).

Results

Experiments across a frequency range of 25 kHz to 1 MHz revealed that defogging rates varied significantly with excitation frequency and actuator configuration, with optimal performance observed at the resonant modes of the substrate. With a 122-kHz ultrasonic load, fog was reduced by over 90% within 5 min, and visibility through the fog improved by over 70%.

Conclusions

The results provide insights into defogging rates at various dynamic conditions, enabling the exploitation and enhancement of anti-fogging performance. Current work presents a promising solution for adaptable anti-fogging of transparent substrates that have important applications in industrial and practical situations.

背景在潮湿环境下，眼镜和护目镜等光学部件上的雾气会显著降低能见度，存在安全风险。虽然通常使用被动防雾方法，如疏水表面涂层，但它们容易降解并且耐久性有限。目的研究一种多物理场主动除雾的方法，利用超声激发增强可见光范围内透明光学表面的防雾性能。方法采用分析、计算和实验相结合的方法来验证超声作为一种主动防雾机制的有效性。分析和计算模型为微液滴与超声能量之间的流体动力学相互作用提供了定量的见解，并通过光学相干断层扫描（OCT）的层析测量进行了验证。定制的环境室配备了温度和湿度控制设备，以及先进的成像工具，使用扫描激光多普勒振动仪（SLDV）监测能见度、表面凝结、热行为和衬底动力学。结果在25 kHz至1 MHz的频率范围内进行的实验表明，除雾率随激励频率和致动器配置而显著变化，在衬底的谐振模式下表现最佳。在122 khz的超声波负载下，雾在5分钟内减少了90%以上，透过雾的能见度提高了70%以上。结论研究了不同动态条件下的防雾率，为开发和提高防雾性能提供了依据。目前的工作为透明基材的自适应防雾提供了一种很有前途的解决方案，在工业和实际应用中都有重要的应用。

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引用次数: 0

Design and Validation of a Symmetric Drop-Weight System for Tensile Intermediate Strain Rate Characterization 用于拉伸中间应变速率表征的对称落重系统的设计与验证

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-10-30 DOI: 10.1007/s11340-025-01239-1

S.F. Hassan, O. Karpenko, G. Cloud, M. Haq

Background

Accurate characterization of materials under intermediate strain rates (1 to 100 s⁻¹) remains a challenge due to complex dynamic effects such as inertial loading, ringing, apparatus compliance, and strain localization. These issues hinder the development of reliable and repeatable tensile testing methods for this critical strain rate regime.

Objective

This study aims to address these limitations by introducing a novel experimental approach that enables high-fidelity tensile testing of both ductile and brittle materials within the defined intermediate strain rate range.

Methods

A symmetric, double-acting drop-weight impact apparatus was designed to implement pure-tensile loading without the need for complex control systems or compensators. The system was validated using aluminum 6061-T6 specimens at two distinct intermediate strain rates and benchmarked against existing literature. The design emphasizes simplicity, cost-efficiency, and accuracy, offering a viable alternative to conventional systems.

Results

The apparatus successfully captured the complete tensile response, including elastic and post-yield behavior, without requiring signal filtration due to the absence of ringing. Strain measurements showed uniform distribution along the gage length, confirming mechanical symmetry and load balance. Test results revealed an explicit strain-rate dependency in yield and ultimate strength, although strain-to-failure values were inconsistent across the strain-rate range.

Conclusions

This novel test fixture offers a reliable and reproducible method for intermediate strain rate tensile testing, surpassing conventional systems in both accuracy and robustness. It lays the foundation for developing a comprehensive experimental database of crash-relevant materials, thereby enhancing testing capabilities for automotive and structural applications.

由于复杂的动态效应，如惯性载荷、环、仪器顺应性和应变局部化，在中等应变速率（1到100秒毒化）下准确表征材料仍然是一个挑战。这些问题阻碍了可靠和可重复的拉伸测试方法的发展。本研究旨在通过引入一种新的实验方法来解决这些局限性，该方法可以在定义的中间应变率范围内对延性和脆性材料进行高保真的拉伸测试。方法设计一种对称、双作用落锤式冲击装置，实现纯拉伸加载，无需复杂的控制系统和补偿器。该系统使用铝6061-T6试样在两种不同的中间应变速率下进行验证，并以现有文献为基准。该设计强调简单、成本效益和准确性，为传统系统提供了可行的替代方案。结果该装置成功捕获了完整的拉伸响应，包括弹性和屈服后行为，而无需由于没有振铃而进行信号过滤。应变测量显示沿片长均匀分布，证实了机械对称和载荷平衡。试验结果显示，屈服和极限强度明显依赖于应变率，尽管应变-破坏值在应变率范围内不一致。这种新型的测试夹具为中间应变率拉伸测试提供了一种可靠的、可重复的方法，在准确性和稳健性方面都超过了传统的系统。它为开发碰撞相关材料的综合实验数据库奠定了基础，从而提高了汽车和结构应用的测试能力。

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引用次数: 0

Buckling Load Prediction of Axially Compressed Pre-Twisted Plates Using the Vibration Correlation Technique 基于振动相关技术的轴向压缩预扭板屈曲载荷预测

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-10-30 DOI: 10.1007/s11340-025-01246-2

I. Kocabaş

Background

Plates are crucial structural components, and techniques for predicting their buckling loads are a critical concern, as buckling can lead to sudden and catastrophic failure. Predicting buckling loads accurately helps improve design and ensure the safety of structural components.

Objective

This study investigates the buckling load and behaviour of pre-twisted plates, aiming to verify the vibration correlation technique (VCT) as a reliable method for predicting buckling loads through comparison with experimental results.

Methods

A specially designed fixture is used to apply a pre-twist angle to the plates, ensuring that they experience initial angular strain–a common real-world scenario. Plates with diverse length-to-width ratios are prepared, and axial compression is gradually applied while maintaining a constant pre-twist angle. Vibration analysis is conducted at various stages of compression, and then the VCT is used to predict the buckling load.

Results

The pre-twist angle significantly enhances bending rigidity. It improves the limit load by up to 50% and a linear relationship is noted between the pre-twist angle and the limit load. Conversely, the post-buckling response remains essentially unchanged. Mixed modes are observed at higher initial angular strain values, causing a decrease in the accuracy of VCT predictions. Although the VCT is a reliable method for flat and slightly twisted plates, its performance degrades with increasing geometric complexity, and deviations reach up to 22.7%.

Conclusion

The pre-twist significantly affects the buckling behaviour. It is reported that the VCT is a partially robust method at lower pre-twist angles, and its use in geometrically non-standard plates requires further methodological refinement.

板是重要的结构部件，其屈曲载荷预测技术是一个关键问题，因为屈曲可能导致突然和灾难性的破坏。准确预测屈曲载荷有助于改进设计，确保结构部件的安全。目的研究预扭板的屈曲载荷及其行为，通过与实验结果的对比，验证振动相关技术（VCT）作为预扭板屈曲载荷预测方法的可靠性。方法采用特殊设计的夹具对钢板施加预扭角，确保它们经历初始角应变-这是现实世界中常见的场景。制备不同长宽比的板材，在保持恒定预扭角的同时，逐渐施加轴向压缩。在压缩的各个阶段进行振动分析，然后利用VCT预测屈曲载荷。结果预扭角显著提高了抗弯刚度。它将极限载荷提高了50%，并且在预扭角和极限载荷之间存在线性关系。相反，屈曲后响应基本保持不变。在较高的初始角应变值下观察到混合模态，导致VCT预测的准确性下降。虽然VCT是一种可靠的方法，但其性能随着几何复杂性的增加而下降，偏差可达22.7%。结论预扭对屈曲行为有显著影响。据报道，在较低的预扭角下，VCT是一种部分稳健的方法，其在几何非标准板中的应用需要进一步的方法改进。

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引用次数: 0

On the Cover: Hinged Rigid Beam Fracture Specimen for Characterization of Lattice and Thin-Sheet Materials 封面：用于点阵和薄板材料表征的铰链刚性梁断裂试样

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics

Pub Date : 2025-10-30 DOI: 10.1007/s11340-025-01244-4

引用次数: 0