2019 15th Hypervelocity Impact Symposium最新文献_第2页

A Predictive Non-Dimensional Scaling Law for the Plate Perforation of Several Aluminum Alloys by Fragment-Simulating Projectiles 几种铝合金破片模拟弹击穿板的预测无量纲标度规律

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-119

Weinong W. Chen, Zherui Guo

引用次数: 5

A penetration model for semi-infinite ultra-high molecular weight polyethylene composite 半无限超高分子量聚乙烯复合材料的穿透模型

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-046

L. H. Nguyen, S. Ryan, A. Orifici, S. J. Cimpoeru

引用次数: 0

Size scaling of crater size, ejecta mass, and momentum enhancement due to hypervelocity impacts into 2024-T4 and 2024-T351 aluminum 2024-T4和2024-T351铝材超高速撞击造成的陨石坑大小、喷出物质量和动量增强的尺寸缩放

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-049

James D. Walker, S. Chocron, D. Grosch

引用次数: 0

Modeling Fragmentation within Pagosa Using Particle Methods 使用粒子方法在Pagosa内建模碎片

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-085

D. Culp, Xia Ma

{"title":"Modeling Fragmentation within Pagosa Using Particle Methods","authors":"D. Culp, Xia Ma","doi":"10.1115/hvis2019-085","DOIUrl":"https://doi.org/10.1115/hvis2019-085","url":null,"abstract":"\u0000 The mechanics involved in shock physics often involves materials undergoing large deformations being subjected to high strain rates and temperature variations. When considering high-velocity impacts and explosions, metals experience plastic flow, dynamic failures and fragmentation that are often too complex for a Lagrangian method, such as the finite element method, to properly resolve. Conversely, Eulerian methods are simple to setup, but often result in numerical diffusion errors [1]. These unpleasantries can be skirted by using an alternative technique that incorporates a blend of these aforementioned methods. FLIP+MPM (FLuid Implicit Particle + Material Point Method) employs Lagrangian points to track state quantities associated with materials as strength, as well as conserved quantities, such as mass. Concurrently, an Eulerian grid is used to calculate gradient fields and incorporate an algorithm that carries out the hydrodynamics [2]. By incorporating the FLIP+MPM method into Los Alamos National Laboratory’s Pagosa hydrodynamics code, massively parallel architectures may be employed to solve such problems as those including fragmentation, plastic flow and fluid-structure interaction. This paper will begin with a mathematical description of the FLIP+MPM technique and describe how it fits into Pagosa. After a description of the implementation, the capabilities of this numerical technique are highlighted by simulating fragmentation as a result of high velocity impacts and explosions. Several strength and damage models will be exercised to demonstrate the code’s flexibility. Comparison of the different models’ fragment size distributions are given and discussed.","PeriodicalId":6596,"journal":{"name":"2019 15th Hypervelocity Impact Symposium","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80016717","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}

引用次数: 0

A rupture limit equation for COPVs following a perforating MMOD impact 射孔MMOD冲击后copv的破裂极限方程

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-026

W. Schonberg

{"title":"A rupture limit equation for COPVs following a perforating MMOD impact","authors":"W. Schonberg","doi":"10.1115/hvis2019-026","DOIUrl":"https://doi.org/10.1115/hvis2019-026","url":null,"abstract":"\u0000 Most spacecraft have at least one pressurized vessel on board. One of the primary design considerations for earth-orbiting spacecraft is the anticipation and mitigation of the possible damage that might occur in the event of a micrometeoroid or orbital debris (MMOD) particle impact. To prevent mission failure and possibly loss of life, protection against perforation by such high-speed impacts must be included. In addition to a hole, it is possible that, for certain pressure vessel designs, materials, impact parameters, and operating conditions, a pressure vessel may experience catastrophic failure (i.e. rupture) as a result of a hypervelocity impact. If such a tank rupture were to occur on-orbit following an MMOD impact, not only could it lead to loss of spacecraft, but quite possibly, for human missions, it could also result in loss of life. In this paper we present an update to a Rupture Limit Equation, or RLE, for composite overwrapped pressure vessels (COPVs) that was presented previously. The update consists of modified RLE parameters and coefficients that were obtained after the RLE was re-derived using new / additional data. The updated RLE functions in a manner similar to that of a ballistic limit equation, or BLE, that is, it differentiates between regions of operating and impact conditions that, given a tank wall perforation, would result in either tank rupture or only a relatively small hole or crack. This is an important consideration in the design of a COPV pressurized tank – if possible, design parameters and operating conditions should be chosen such that additional sizable debris (such as that which would be created in the event of tank rupture or catastrophic failure) is not created as a result of an on-orbit MMOD particle impact.","PeriodicalId":6596,"journal":{"name":"2019 15th Hypervelocity Impact Symposium","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90197671","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}

引用次数: 0

Evaluation of Critical Ricochet Angles for 25mm APDS-T Projectile on Metallic Targets - Modeling and Verification 25mm APDS-T弹丸在金属靶上的临界弹跳角评估——建模与验证

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-069

A. Weiss, A. Borenstein, V. Paris, M. Ravid, N. Shapira

引用次数: 1

Study on phase transformation in Tin under dynamic compression 动态压缩下锡的相变研究

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-027

C. Chauvin, F. Zucchini, David Palma de Barros

{"title":"Study on phase transformation in Tin under dynamic compression","authors":"C. Chauvin, F. Zucchini, David Palma de Barros","doi":"10.1115/hvis2019-027","DOIUrl":"https://doi.org/10.1115/hvis2019-027","url":null,"abstract":"\u0000 We propose to study experimentally the polymorphic transition of Tin under dynamic compression. These transformations have been investigated for a long time through usual velocity measurements under shock from ambient condition. At CEA Gramat we have improved our understanding of such phase transformations through both experimental and theoretical means.\u0000 Experimental velocity measurements have long suggested that non equilibrium behavior and kinetics is an important part of the dynamic compression response of materials undergoing phase transformations. Empirical kinetic models can in many cases reproduce the experimental velocity profiles, but without clearly identifying the nature of the transition.\u0000 For nearly two decades, the CEA Gramat operates several gas guns for shock loading and high pulsed power (HPP) drivers dedicated to Isentropic Compression Experiments (ICE) up to several GPa. These experimental devices and associated diagnostics (velocimetry and temperature measurements and x-ray diffraction experiments) help to begin to study kinetics under dynamic transition in a more rigorous manner. We have used these experiments to examine various compression paths and have used the results to improve equation of state (EOS) models incorporated in our numerical codes. The latter can be used to run simulations starting with ambient initial conditions, then load metallic materials from various non ambient initial temperatures. This can significantly extend the range of our studies into previously unexplored thermodynamic paths.\u0000 We propose to describe our preheating devices for gas gun experiments and our HPP driver, and to present our preliminary results on shock loading and on isentropic compression at various initial temperatures, to explore the phase diagram of Tin.\u0000 In addition, we present the design of promising testing on X-ray diffraction under shock to help to develop a more physical kinetic model relying on nucleation and growth mechanisms, which are implemented in our continuum level codes.","PeriodicalId":6596,"journal":{"name":"2019 15th Hypervelocity Impact Symposium","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75422118","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}

引用次数: 0

Analytically derived space time-based boundary condition (STBC) to account for stress wave propagation in a heterogeneous micromechanical model at hypervelocity impact 解析导出了基于时空的边界条件(STBC)，以解释超高速碰撞时应力波在非均质微观力学模型中的传播

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-090

Zhiye Li, Somnath Ghosh

{"title":"Analytically derived space time-based boundary condition (STBC) to account for stress wave propagation in a heterogeneous micromechanical model at hypervelocity impact","authors":"Zhiye Li, Somnath Ghosh","doi":"10.1115/hvis2019-090","DOIUrl":"https://doi.org/10.1115/hvis2019-090","url":null,"abstract":"\u0000 Recent years have seen a surge in research on material and structural response of composites using the homogenization based hierarchical modeling method. The microstructural representative volume element (RVE) is a small micro-region for which the volume average of variables is the same as those for the entire body. Representations of the microstructure are used for micromechanical simulations in determination of effective material properties by homogenization. Conventionally, periodic boundary conditions (PBC) are applied on the RVE boundary. However, when the heterogeneous microstructure is under very high strain rate loading conditions (105s−1−107s−1), periodic boundary conditions (PBC) do not accurately represent the effect of stress wave propagation. Improper boundary conditions can lead to significant error in homogenized material properties. In order to increase the accuracy of the homogenization model, this study introduces a new space-time dependent boundary condition (STBC) for a 3D microscopic RVE subjected to high strain rate deformation in explicit FEM simulation by using the characteristics method of traveling waves. The advantages of the STBC are discussed in comparison with time-dependent averaged results of examples using PBC. The proposed STBC offers significant advantages over conventional PBC in the RVE-based analysis of heterogeneous materials.","PeriodicalId":6596,"journal":{"name":"2019 15th Hypervelocity Impact Symposium","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84503370","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}

引用次数: 0

Assessment and Validation of Collision “Consequence” Method of Assessing Orbital Regime Risk Posed by Potential Satellite Conjunctions 基于碰撞“后果”方法的轨道状态风险评估与验证

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-061

T. Lechtenberg, M. Hejduk

{"title":"Assessment and Validation of Collision “Consequence” Method of Assessing Orbital Regime Risk Posed by Potential Satellite Conjunctions","authors":"T. Lechtenberg, M. Hejduk","doi":"10.1115/hvis2019-061","DOIUrl":"https://doi.org/10.1115/hvis2019-061","url":null,"abstract":"\u0000 Collision risk management theory requires a thorough assessment of both the likelihood and consequence of potential collision events. Satellite conjunction risk assessment has produced a highly-developed theory for assessing the likelihood of collision but typically neglects to account for the consequences of a given collision. While any collision may compromise the operational survival of a space-craft, the amount of debris produced by the potential collision, and therefore the degree to which the orbital corridor may be compromised, can vary greatly among satellite conjunctions. Previous studies leveraged work on satellite collision modeling to develop a method to estimate whether a particular collision is likely to produce a relatively large or relatively small amount of resultant debris. The approximation of the number of debris pieces is dependent on a mass estimation process for the secondary objects utilizing the radar cross section of said object. This study examines the validity of the mass estimation process and establishes uncertainty bounds on the secondary object mass which will be used to best approximate the possible consequences of a prospective collision.","PeriodicalId":6596,"journal":{"name":"2019 15th Hypervelocity Impact Symposium","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73567516","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}

引用次数: 2

Comparison of the Hydrodynamic Ram Caused by Single and Two Projectiles Impacting Water-filled Containers 单弹与双弹撞击充水容器的水动力冲击比较

2019 15th Hypervelocity Impact Symposium Pub Date : 2019-04-14 DOI: 10.1115/hvis2019-068

Yangziyi Ji, Xiangdong Li, Lanwei Zhou, Xiaoying Lan

引用次数: 0