内容简介
This book contains 26 top-quality papers that were presented at the Third International Symposium on Plasticity and Impact (ISPI 2011) held in Hong Kong and Nansha, China on 8-12 December 2011. It reports on recent developments in the field of plasticity and impact engineering research from both the fundamental science and industrial application perspectives. The ISPI 2011 was dedicated to commemorate Professor Tongxi Yu's 70thbirthday and his recent retirement from the Hong Kong University of Science and Technology.It was specifically aimed at bringing together colleagues, friends and former graduate students of Professor Yu to discuss and exchange information on recent developments in plasticity and impact engineering, and to present their latest findings.
内页插图
目录
CHARACTERISTICS ANALYSES OF NONLINEAR VISCO-ELASTIC SPHERICAL WAVES
AN ELASTOPLASTIC CONSTITUTIVE MODEL OF POROUS MATERIALS
NANOPARTICLE MODIFICATION ON MECHANICAL PROPERTIES OF EPOXY RESIN
EXPERIMENTAL AND NUMERICAL STUDY ON METAL RING SYSTEMS SUBJECTED TO IMPACT LOADING
EFFECT OF DEFORMATION-INDUCED REORIENTATION ON PLASTIC BEHAVIOR IN A STRETCHED SHEET OF NEMATIC ELASTOMER
COUPLED FLEXURAL-TORSIONAL VIBRATION OF DELAMINATED BEAMS SUBJECTED TO AXIAL LOADS AND STATIC END MOMENTS
石墨烯折叠力学的研究
INSTABILITY OF GRAPHITE UNDER HIGH PRESSURE
EXPERIMENTAL INVESTIGATION OF RADIAL DYNAMIC RESPONSE OF TINI THIN-WALLED TUBES
NON-AXISYMMETRIC BEHAVIOR OF POST-BUCKLING FOR CYLINDRICAL SHELLS UNDER THERMAL IMPACT
WAVE PROPAGATION IN CELLULAR MATERIALS UNDER IMPACT LOADING
COMPRESSIVE RESPONSE OF CELLULAR MATERIALS THROUGH PARAMETER
MANIPULATION OF DIFFERENT MODELS
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精彩书摘
Plasticity covers all aspects of plastic deformation, damage and fracture behaviour of isotropic as well as anisotropic solids, including the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena. Impactengineering is the subject related to the response of structures, bodies and materials from the exposure to impact and blast events. This book contains 26 top-quality papers that were presented at the Third International Symposium on Plasticity and Impact (ISPI 2011)held on December 8-12, 2011 in Hong Kong and Nansha, China. It reports on recentdevelopments in the field of plasticity and impact engineering research from both thefundamental science and industrial application perspective.The ISPI 2011 was dedicated to commemorate Professor Tongxi Yu's 70th birthday and his recent retirement from the Hong Kong University of Science and Technology. It wasspecifically aimed at bringing together colleagues, friends and former graduate students of Professor Yu to discuss and exchange information on recent developments in plasticity and impact engineering, and to present their latest findings. Its major aims include: i) to exchange information on recent developments in plasticity and impact engineering, ii) tofoster cross-disciplinary discussion on plasticity and impact engineering, iii) to encourageresearch and development (R & D) collaborations among researchers from Hong Kong,Mainl and China and International Institutions, and iv) to strengthen the tie betweeninstitutes in Hong Kong and Mainland China.We wish to thank all participants who contributed papers and presentations to the ISPI2011. Thanks are due to the members of the Organising Committee, in particular the teamled by Miss. Ellie Ho of HKUST, for their efforts in making the ISPI 2011 a great success. Wealso acknowledge with gratitude the following organizations for their contributions as the major sponsors: the K.C. Wong Education Foundation and the Fok Ying Tung Graduate School of the HKUST.
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前言/序言
塑性力学与冲击动力学进展(英文版)[Advances in Plasticity and Impact Dynamics] 图书简介 本书内容聚焦于塑性形变行为的深刻理解、材料在高应变率下的响应机制,以及与此相关的复杂工程问题的数值模拟与实验验证,旨在为该领域的研究人员、工程师及高年级学生提供一个前沿且全面的视角。 本书并非涉及“塑性力学与冲击动力学进展”这一特定主题,而是全面涵盖了现代固体力学中,特别是在大变形、高应变率加载条件下的若干关键分支。 --- 第一部分:基础理论与本构关系的新发展 (Fundamental Theories and Advances in Constitutive Modeling) 本部分深入探讨了描述材料塑性行为的理论框架,尤其关注传统模型在极端条件下的局限性及现代改进方案。 1. 连续介质力学与非线性几何效应: 本书首先回顾了描述连续介质运动和平衡的基本方程,但重点转向了适用于大变形和强旋转情况的非线性弹性与塑性理论。详细分析了拉格朗日和欧拉描述下的运动学公式,特别关注了涉及旋转张量、变形梯度和对数应变张量的精确表述。讨论了如何建立与特定坐标系无关的本构方程,避免在数值求解中引入不必要的奇异性。 2. 晶体塑性与微观机制驱动的模型: 深入剖析了从微观晶体结构到宏观力学响应的桥梁——晶体塑性理论(Crystal Plasticity Theory, CPT)。详细阐述了位错运动、滑移系统激活准则(如 Schmid 律的修正形式)以及硬化规律(如自协商硬化和累积硬化)在速率依赖性塑性中的应用。讨论了如何利用晶体塑性有限元法(CPFE)模拟多晶体材料的取向依赖性、织构演化以及晶界处的应力集中现象,这对于理解增材制造材料和轧制金属的性能至关重要。 3. 损伤、断裂与耦合效应: 塑性变形的极限往往与损伤的累积和最终断裂相关联。本书专门开辟章节讨论了在塑性载荷下的材料失效模型。这包括内聚力模型(Cohesive Zone Models, CZM)在模拟裂纹萌生与扩展中的应用,尤其是在疲劳和蠕变损伤的耦合作用下。此外,还探讨了热塑性软化(Thermal Softening)对模型精度的影响,即在高速变形中,绝热加热如何显著降低材料的屈服强度并加速失稳。 4. 粘塑性和粘弹性-塑性模型: 对于聚合物、高分子复合材料以及某些金属在高温下的行为,粘塑性效应不可忽略。书中详细介绍了Johnson-Cook模型之外的更先进的粘塑性本构模型,如Perzyna模型和基于蠕变机制的模型。强调了如何通过粘滞系数和松弛时间来精确捕捉应变率的依赖性以及时间对材料响应的长期影响。 --- 第二部分:冲击与高速加载响应的物理现象 (Physical Phenomena in Impact and High Strain Rate Response) 本部分集中于材料和结构在极短时间尺度上经历的动态加载过程,这是理解爆炸、碰撞和超高速加工的关键。 1. 应变率敏感性与动态屈服: 详细分析了材料(特别是金属和陶瓷)动态屈服强度的变化规律。探讨了不同测试技术——如霍普金森杆(Split Hopkinson Pressure Bar, SHPB)和直接冲击实验——所获得的材料数据,以及如何校准模型以反映这些高应变率下的特征。讨论了泰勒-坎迪(Taylor-Quinney)系数在描述动态响应中的作用。 2. 材料的失效模式与动态韧性: 研究了在冲击载荷下材料表现出的特殊失效机制,如剪切带形成(Shear Banding)和绝热剪切局部化(Adiabatic Shear Localization, ASL)。分析了ASL的形成条件、传播速度及其对结构完整性的影响。书中还探讨了冲击诱发的相变(例如,某些金属在极高压力下的晶体结构变化)如何改变材料的力学性能。 3. 动态本构的实验表征技术: 详尽介绍了用于捕捉瞬态行为的先进实验技术。这包括但不限于:激光多普勒测速仪(LDV)在表面粒子速度测量中的应用;高速电荷耦合器件(CCD)相机配合数字图像相关(DIC)技术在全场应变测量中的进展;以及同步辐射光源在时空尺度上解析晶体结构变化的潜力。 --- 第三部分:冲击与塑性问题的数值模拟方法 (Numerical Methods for Impact and Plasticity Problems) 本部分重点介绍了解决高度非线性、大变形和瞬态动力学问题的计算力学技术。 1. 显式动力学有限元分析 (Explicit Dynamics FEA): 详细阐述了显式有限元方法在处理冲击、碰撞和爆炸等非线性瞬态问题中的优势。讨论了时间积分方案(如中心差分法)、稳定性条件(CFL条件)的控制,以及如何高效处理接触、材料非线性和大变形网格畸变问题。 2. 高精度和无网格方法: 除了传统的有限元法,本书还介绍了新兴的计算工具。特别是光滑粒子流体力学(Smoothed Particle Hydrodynamics, SPH)和扩展有限元法(XFEM)在模拟自由表面流动、材料破碎以及裂纹扩展等复杂几何问题中的应用。探讨了这些方法如何避免网格重划分的复杂性,从而更直接地模拟材料的动态破碎过程。 3. 耦合分析与多尺度建模: 讨论了如何将不同尺度的模型进行有效耦合。例如,如何使用微观尺度的晶体塑性结果作为宏观模型中本构关系的输入(尺度传递)。此外,还涵盖了流固耦合(FSI)和热固耦合(Thermo-Mechanical Coupling)在模拟高速穿透或极端热载荷下的结构响应中的必要性。 --- 第四部分:工程应用与案例研究 (Engineering Applications and Case Studies) 最后,本书通过具体的工程实例,展示了理论与数值方法在解决实际问题中的应用价值。 1. 穿透、侵彻与防护工程: 分析了弹体侵彻装甲、高速撞击响应以及爆炸载荷下的结构响应问题。案例研究包括轻质复合材料的抗冲击设计、多层防护结构的优化以及爆炸成型(Explosive Forming)的工艺模拟。重点在于如何利用动态本构模型和侵彻动力学理论来预测穿透深度和残余结构完整性。 2. 制造工艺中的塑性控制: 探讨了在金属加工领域中,如何应用塑性力学原理来优化工艺参数。例如,冷锻、深冲以及高速切削过程中的残余应力控制、模具设计和材料流动预测。分析了高速加工中热效应和动态软化对产品精度和性能的影响。 3. 极端环境下的结构完整性评估: 涵盖了涉及极端载荷的结构安全问题,如地震工程中的非线性动力响应、航空航天器再入大气层时的高速气动热与结构耦合问题,以及核设施中对冲击波和振动的响应分析。 --- 总结而言,本书提供了一套严谨的、面向前沿的知识体系,它建立在坚实的理论基础之上,融合了先进的实验技术和计算模拟工具,致力于解决当代工程和材料科学中极具挑战性的塑性变形与动态载荷问题。 其内容侧重于机制的深入理解和高精度数值工具的开发与应用。