Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25108
J. Merodio, R. Sancibrian, F. Viadero
The study focuses on instabilities for fiber-reinforced nonlinearly elastic solids under plane deformations. The plane of deformation contains the fiber reinforcement. In particular, fiber kinking and fiber debonding instabilities in fiber-reinforced composite materials are examined in terms of the anisotropic character of the material models. The material models consider simultaneously the material anisotropy and the nonlinear performance of the fiber reinforced materials. Fiber kinking is captured under fiber compresion. Fiber debonding is captured under shearing deformations in the fiber direction.
{"title":"Failure Prevention in Fiber Reinforced Composite Materials","authors":"J. Merodio, R. Sancibrian, F. Viadero","doi":"10.1115/imece2001/de-25108","DOIUrl":"https://doi.org/10.1115/imece2001/de-25108","url":null,"abstract":"\u0000 The study focuses on instabilities for fiber-reinforced nonlinearly elastic solids under plane deformations. The plane of deformation contains the fiber reinforcement. In particular, fiber kinking and fiber debonding instabilities in fiber-reinforced composite materials are examined in terms of the anisotropic character of the material models. The material models consider simultaneously the material anisotropy and the nonlinear performance of the fiber reinforced materials. Fiber kinking is captured under fiber compresion. Fiber debonding is captured under shearing deformations in the fiber direction.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"364 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114085558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25107
A. Saigal, R. Greif, Y. Duan, M. Zimmerman
The multiaxial impact behavior of CYCOLAC GPM5500 (ABS glassy polymer) is obtained as a function of impact velocity and temperature from the standard impact test as specified by ASTM D3763. Finite element analysis (FEA) and ABAQUS/Explicit are used to model the impact behavior of the polymer. The generalized “DSGZ” constitutive model, previously developed by the authors and calibrated using low strain rate uniaxial mechanical test data, is extended to the high strain rate regime and used in the finite element analysis. Load-displacement curves from the finite element analysis are compared with the experimental data and agree well up to the maximum impact load (failure). Therefore, the proposed finite element analysis model can be used to predict the multiaxial impact behaviors of polymers at different temperatures and impact velocities.
{"title":"Multiaxial Impact Behavior and Modeling of ABS Polymer","authors":"A. Saigal, R. Greif, Y. Duan, M. Zimmerman","doi":"10.1115/imece2001/de-25107","DOIUrl":"https://doi.org/10.1115/imece2001/de-25107","url":null,"abstract":"\u0000 The multiaxial impact behavior of CYCOLAC GPM5500 (ABS glassy polymer) is obtained as a function of impact velocity and temperature from the standard impact test as specified by ASTM D3763. Finite element analysis (FEA) and ABAQUS/Explicit are used to model the impact behavior of the polymer. The generalized “DSGZ” constitutive model, previously developed by the authors and calibrated using low strain rate uniaxial mechanical test data, is extended to the high strain rate regime and used in the finite element analysis. Load-displacement curves from the finite element analysis are compared with the experimental data and agree well up to the maximum impact load (failure). Therefore, the proposed finite element analysis model can be used to predict the multiaxial impact behaviors of polymers at different temperatures and impact velocities.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130255960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25104
D. Leray, A. Daidié, B. Combes
Fatigue failure is a common problem with bolted joints. Preloading can often offer great advantage, in that it reduces the intensity of the alternative part of strains. Although it is more and more usual to carry out very precise finite element calculations, it should be highlighted that the error arising from simulations or experiments may be surprisingly great when looking at supplements of strain, i.e. alternative strain. That is one of the reasons why designing preloaded bolted joints requires great care, and sometimes turns out to be impractical. A partnership has been established for several years with a group of industrial manufacturers and users of slewing bearings. The objective is to model a parameterised bolt-assembled slewing bearing system and to develop a simulation tool that • allows us to check resistance of the bolts for maximum load as well as fatigue load • runs much faster than a three-dimensional simulation in order to enable us to compare multiple configurations, in order to be used in early design stages.
{"title":"Rapid Simulation of Preloaded Bolted Assemblies for Slewing Bearings","authors":"D. Leray, A. Daidié, B. Combes","doi":"10.1115/imece2001/de-25104","DOIUrl":"https://doi.org/10.1115/imece2001/de-25104","url":null,"abstract":"\u0000 Fatigue failure is a common problem with bolted joints. Preloading can often offer great advantage, in that it reduces the intensity of the alternative part of strains. Although it is more and more usual to carry out very precise finite element calculations, it should be highlighted that the error arising from simulations or experiments may be surprisingly great when looking at supplements of strain, i.e. alternative strain.\u0000 That is one of the reasons why designing preloaded bolted joints requires great care, and sometimes turns out to be impractical.\u0000 A partnership has been established for several years with a group of industrial manufacturers and users of slewing bearings. The objective is to model a parameterised bolt-assembled slewing bearing system and to develop a simulation tool that\u0000 • allows us to check resistance of the bolts for maximum load as well as fatigue load\u0000 • runs much faster than a three-dimensional simulation in order to enable us to compare multiple configurations, in order to be used in early design stages.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132630368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25103
K. Iyer, C. Rubin, G. Hahn
Three-dimensional finite element analysis of an elastic, double rivet-row, aluminum alloy lap joint with countersunk, aluminum and steel rivets, is presented. Relations between the connection compliance, rivet deformation, peak contact pressures and slip amplitudes, in the absence of interference and clamp-up, are described. Analysis of a connection with non-countersunk rivets is presented in a companion paper. The trends seen in the results are similar to those obtained with non-countersunk rivets, although the peak stress concentrations in the present case are much higher. A superposition approach for estimating stress concentration factors in the panels of multi-row riveted connections with standard or countersunk rivets is presented.
{"title":"Three-Dimensional Analysis of Double Rivet-Row Lap Joints: Part II — Countersunk Rivets","authors":"K. Iyer, C. Rubin, G. Hahn","doi":"10.1115/imece2001/de-25103","DOIUrl":"https://doi.org/10.1115/imece2001/de-25103","url":null,"abstract":"\u0000 Three-dimensional finite element analysis of an elastic, double rivet-row, aluminum alloy lap joint with countersunk, aluminum and steel rivets, is presented. Relations between the connection compliance, rivet deformation, peak contact pressures and slip amplitudes, in the absence of interference and clamp-up, are described. Analysis of a connection with non-countersunk rivets is presented in a companion paper. The trends seen in the results are similar to those obtained with non-countersunk rivets, although the peak stress concentrations in the present case are much higher. A superposition approach for estimating stress concentration factors in the panels of multi-row riveted connections with standard or countersunk rivets is presented.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129995399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25106
Kamal Sh. Babamuratov, R. Abirov
In this report results of systematic researches of the experimental-theoretical CL-computer (complex loading) method, offered by Ilyushin for solving of problem of strength and strains of elastic-plastic bodies at an incomplete theoretical information about the equations of relation between stresses and strains and the method of appraisal of reliability of plasticity problems’ solution are given. Homogeneous and nonhomogeneous problems for element of construction in form of the rods, plates, shell are accomplished. The results of numerical and CL experiments indicate on perspectivity of considered methods for calculations and projection of responsible designs in an engineering and building.
{"title":"The New Approach to the Analysis of Elasto-Plastic Deformation of Solids Within the Bounds of Theory of Processes by A. A. Ilyushin","authors":"Kamal Sh. Babamuratov, R. Abirov","doi":"10.1115/imece2001/de-25106","DOIUrl":"https://doi.org/10.1115/imece2001/de-25106","url":null,"abstract":"\u0000 In this report results of systematic researches of the experimental-theoretical CL-computer (complex loading) method, offered by Ilyushin for solving of problem of strength and strains of elastic-plastic bodies at an incomplete theoretical information about the equations of relation between stresses and strains and the method of appraisal of reliability of plasticity problems’ solution are given.\u0000 Homogeneous and nonhomogeneous problems for element of construction in form of the rods, plates, shell are accomplished. The results of numerical and CL experiments indicate on perspectivity of considered methods for calculations and projection of responsible designs in an engineering and building.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132942696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25105
Shijie Wang, G. Hong
In this paper we apply internal gear drive pair, with zero-tooth-difference, in the coupling mechanism to connect the output shaft of reducer and the rotor of pump in the submerged-motor-driven PC pumping system for oil production. Because there are dual modifications along radial and tangential direction for the cut of gear teeth, the gear-tooth thickness will be reduced and thus the strength of the teeth will be weakened evidently. At present, there is no theoretical criteria for the strength verification suitable for such mechanism design. The new calculating formulae for contacting stress of tooth surface and bending stress of tooth-root were established in this paper just for this reason, which not only provide the strength verifying criteria for gear-tooth but can also be regarded as the theoretical basis for the design of internal gear drive mechanism with zero-tooth-difference.
{"title":"Theoretical Analysis of the Strength of Internal Gear Drive With Zero-Tooth-Difference","authors":"Shijie Wang, G. Hong","doi":"10.1115/imece2001/de-25105","DOIUrl":"https://doi.org/10.1115/imece2001/de-25105","url":null,"abstract":"\u0000 In this paper we apply internal gear drive pair, with zero-tooth-difference, in the coupling mechanism to connect the output shaft of reducer and the rotor of pump in the submerged-motor-driven PC pumping system for oil production. Because there are dual modifications along radial and tangential direction for the cut of gear teeth, the gear-tooth thickness will be reduced and thus the strength of the teeth will be weakened evidently. At present, there is no theoretical criteria for the strength verification suitable for such mechanism design. The new calculating formulae for contacting stress of tooth surface and bending stress of tooth-root were established in this paper just for this reason, which not only provide the strength verifying criteria for gear-tooth but can also be regarded as the theoretical basis for the design of internal gear drive mechanism with zero-tooth-difference.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121766794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25109
J. Auersperg, E. Kieselstein, Andreas Schubert, B. Michel
The increasing use of advanced electronic packages like Flip Chips and CSP under harsh environmental conditions, extreme temperatures is often a reason for damage, fatigue and failure of entire components and systems. Consequently, their thermo-mechanical reliability is one of the most important preconditions for adopting these technologies in industrial applications. To prevent chips from being exposed to the external environment integrated circuits are usually encapsulated into packages. As a result, a microelectronic package is basically a compound of several materials with quite different Young’s moduli and thermal expansion coefficients. Additionally, various kinds of inhomogeneity, residual stresses from several steps of the manufacturing process contribute to interface delaminations, chip cracking and fatigue of solder interconnects. This paper intends to describe the investigation of damage and interface delamination phenomena in micro components by numerical investigations by means of fracture mechanics concepts based on nonlinear FEA and experimental investigations. Consequently, the contribution shows the use of non-linear finite element simulations with respect to the nonlinear, temperature and rate dependent behavior of different materials used, the application of fracture mechanics concepts (energy release rate, integral fracture approaches, mode-mixity examinations) in combination with experimental investigations. For these purpose, bending specimens consisting of several materials interfaces widely used in FC ssemblies and CSP have been investigated in particular. In order to evaluate the different approaches used some results have been compared to micrographs from growing interface delaminations by using micro deformation measurements on the basis of a gray scale correlation method applied to micrographs, in particular. The methodology explained is a helpful basis for understanding and evaluating failure mechanisms especially of several polymer material interfaces as well as of solder joints in a more consistent manner. It should support further applications for raising the thermo-mechanical reliability of advanced electronic packages.
{"title":"Mixed Mode Interfacial Fracture Toughness Evaluation for Flip-Chip Assemblies and CSP Based on Fracture Mechanics Approaches","authors":"J. Auersperg, E. Kieselstein, Andreas Schubert, B. Michel","doi":"10.1115/imece2001/de-25109","DOIUrl":"https://doi.org/10.1115/imece2001/de-25109","url":null,"abstract":"\u0000 The increasing use of advanced electronic packages like Flip Chips and CSP under harsh environmental conditions, extreme temperatures is often a reason for damage, fatigue and failure of entire components and systems. Consequently, their thermo-mechanical reliability is one of the most important preconditions for adopting these technologies in industrial applications. To prevent chips from being exposed to the external environment integrated circuits are usually encapsulated into packages. As a result, a microelectronic package is basically a compound of several materials with quite different Young’s moduli and thermal expansion coefficients. Additionally, various kinds of inhomogeneity, residual stresses from several steps of the manufacturing process contribute to interface delaminations, chip cracking and fatigue of solder interconnects. This paper intends to describe the investigation of damage and interface delamination phenomena in micro components by numerical investigations by means of fracture mechanics concepts based on nonlinear FEA and experimental investigations. Consequently, the contribution shows the use of non-linear finite element simulations with respect to the nonlinear, temperature and rate dependent behavior of different materials used, the application of fracture mechanics concepts (energy release rate, integral fracture approaches, mode-mixity examinations) in combination with experimental investigations. For these purpose, bending specimens consisting of several materials interfaces widely used in FC ssemblies and CSP have been investigated in particular. In order to evaluate the different approaches used some results have been compared to micrographs from growing interface delaminations by using micro deformation measurements on the basis of a gray scale correlation method applied to micrographs, in particular. The methodology explained is a helpful basis for understanding and evaluating failure mechanisms especially of several polymer material interfaces as well as of solder joints in a more consistent manner. It should support further applications for raising the thermo-mechanical reliability of advanced electronic packages.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117206422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25111
J. Condon
As part of a US Army Research Laboratory (Aberdeen Proving Ground, MD) project to provide electromechanical packaging support for a developmental gun-hardened, munition-deployed, parachute-deployed video imager, a dynamic FEA structural analysis was performed on the imager’s aluminum housing. This imager can provide real-time, telemetered, digitally-encrypted and encoded video imaging of the battlefield. The housing was designed as a carrier for the power distribution electronics; video encoding electronics; telemetry transmitter and wrap-around antenna; rechargeable NiCad batteries; and CCD camera module, and provided for direct replacement of an existing illumination canister within a modified US Army 120mm mortar system. The imager assembly, once inserted within the mortar body, is first exposed to a launch ‘setback’ acceleration load upon firing and then is exposed to an explosively-generated internal pressure and impact loading upon in-flight fuze initiation, mortar body separation and subsequent imager submunition expulsion. The dynamic analysis entailed verification of the structural integrity and deflections of the imager housing and adjacent impacting steel ‘pusher’ plate under launching, pressure, and impact loadings. A 2-D axi-symmetric, quadrilateral-only, finite element model of the housing and pusher plate was constructed. Contact elements, birth & death displacement constraints and simplified mortar body elements were added to simulate the boundary conditions. Analysis predictions were validated by inspection of the recovered imager hardware following flight testing.
{"title":"Design of a Mortar-Deployed Video Imager","authors":"J. Condon","doi":"10.1115/imece2001/de-25111","DOIUrl":"https://doi.org/10.1115/imece2001/de-25111","url":null,"abstract":"\u0000 As part of a US Army Research Laboratory (Aberdeen Proving Ground, MD) project to provide electromechanical packaging support for a developmental gun-hardened, munition-deployed, parachute-deployed video imager, a dynamic FEA structural analysis was performed on the imager’s aluminum housing. This imager can provide real-time, telemetered, digitally-encrypted and encoded video imaging of the battlefield. The housing was designed as a carrier for the power distribution electronics; video encoding electronics; telemetry transmitter and wrap-around antenna; rechargeable NiCad batteries; and CCD camera module, and provided for direct replacement of an existing illumination canister within a modified US Army 120mm mortar system. The imager assembly, once inserted within the mortar body, is first exposed to a launch ‘setback’ acceleration load upon firing and then is exposed to an explosively-generated internal pressure and impact loading upon in-flight fuze initiation, mortar body separation and subsequent imager submunition expulsion. The dynamic analysis entailed verification of the structural integrity and deflections of the imager housing and adjacent impacting steel ‘pusher’ plate under launching, pressure, and impact loadings. A 2-D axi-symmetric, quadrilateral-only, finite element model of the housing and pusher plate was constructed. Contact elements, birth & death displacement constraints and simplified mortar body elements were added to simulate the boundary conditions. Analysis predictions were validated by inspection of the recovered imager hardware following flight testing.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121589497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Both experimental investigation and finite element analysis were conducted to explore the mechanisms of the early stage self-loosening of bolted joints under transverse cyclic loading. The nuts were glued to the bolts using a strong thread locker in the self-loosening experiments to ensure that no backing-off of the nut occurred. Depending on the loading magnitude, the clamping force reduction ranged from 10% to more than 40% of the initial preload after 200 loading cycles. Three-dimensional elastic-plastic finite element analysis was conducted with the implementation of an advanced cyclic plasticity model. The finite element results revealed that the local cyclic plasticity occurring near the roots of the engaged threads resulted in cyclic strain ratchetting. The localized cyclic plastic deformation caused the stresses to redistribute in the bolt, and the result was the gradual loss of clamping force with loading cycles. The finite element results agreed with the experimental observations quantitatively. Both experiments and finite element simulations suggested that the friction between the clamped plates has an insignificant influence on self-loosening.
{"title":"A Study of Early Stage Self-Loosening of Bolted Joints","authors":"Yanyao Jiang, Ming Zhang, Chu-hwa Lee","doi":"10.1115/1.1586936","DOIUrl":"https://doi.org/10.1115/1.1586936","url":null,"abstract":"\u0000 Both experimental investigation and finite element analysis were conducted to explore the mechanisms of the early stage self-loosening of bolted joints under transverse cyclic loading. The nuts were glued to the bolts using a strong thread locker in the self-loosening experiments to ensure that no backing-off of the nut occurred. Depending on the loading magnitude, the clamping force reduction ranged from 10% to more than 40% of the initial preload after 200 loading cycles. Three-dimensional elastic-plastic finite element analysis was conducted with the implementation of an advanced cyclic plasticity model. The finite element results revealed that the local cyclic plasticity occurring near the roots of the engaged threads resulted in cyclic strain ratchetting. The localized cyclic plastic deformation caused the stresses to redistribute in the bolt, and the result was the gradual loss of clamping force with loading cycles. The finite element results agreed with the experimental observations quantitatively. Both experiments and finite element simulations suggested that the friction between the clamped plates has an insignificant influence on self-loosening.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121923969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-11DOI: 10.1115/imece2001/de-25110
M. S. Hollis
Future gun-launched projectiles will have higher muzzle velocities. There currently exists a need for RF transparent radome solutions with muzzle velocities near Mach numbers equal to 3 (M = 3). Future Combat System (FCS) requirements may push these velocities as high as M = 5. Assessments of aerothermal heating requirements for specific radome geometries need to be studied. Trade-off studies involving aerodynamic shape, antenna location, materials, and RF characteristics also need to be made. The final product of this report is twofold. The first is a short-term solution using the extruded/molded plastics to manufacture a radome. The other is a guideline for a more extensive study to find several solutions for high speed, RF transparent radomes for ballistic projectiles.
{"title":"Parameterized Design of a Supersonic Radome","authors":"M. S. Hollis","doi":"10.1115/imece2001/de-25110","DOIUrl":"https://doi.org/10.1115/imece2001/de-25110","url":null,"abstract":"\u0000 Future gun-launched projectiles will have higher muzzle velocities. There currently exists a need for RF transparent radome solutions with muzzle velocities near Mach numbers equal to 3 (M = 3). Future Combat System (FCS) requirements may push these velocities as high as M = 5. Assessments of aerothermal heating requirements for specific radome geometries need to be studied. Trade-off studies involving aerodynamic shape, antenna location, materials, and RF characteristics also need to be made.\u0000 The final product of this report is twofold. The first is a short-term solution using the extruded/molded plastics to manufacture a radome. The other is a guideline for a more extensive study to find several solutions for high speed, RF transparent radomes for ballistic projectiles.","PeriodicalId":231127,"journal":{"name":"Threaded and Riveted Connections, Design Issues, Reliability, Stress Analysis, and Failure Prevention","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125965377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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