內容簡介
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.
內頁插圖
目錄
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
石墨烯摺疊力學的研究
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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精彩書摘
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
塑性力學與衝擊動力學進展(英文版)[Advances in Plasticity and Impact Dynamics] 圖書簡介 本書內容聚焦於塑性形變行為的深刻理解、材料在高應變率下的響應機製,以及與此相關的復雜工程問題的數值模擬與實驗驗證,旨在為該領域的研究人員、工程師及高年級學生提供一個前沿且全麵的視角。 本書並非涉及“塑性力學與衝擊動力學進展”這一特定主題,而是全麵涵蓋瞭現代固體力學中,特彆是在大變形、高應變率加載條件下的若乾關鍵分支。 --- 第一部分:基礎理論與本構關係的新發展 (Fundamental Theories and Advances in Constitutive Modeling) 本部分深入探討瞭描述材料塑性行為的理論框架,尤其關注傳統模型在極端條件下的局限性及現代改進方案。 1. 連續介質力學與非綫性幾何效應: 本書首先迴顧瞭描述連續介質運動和平衡的基本方程,但重點轉嚮瞭適用於大變形和強鏇轉情況的非綫性彈性與塑性理論。詳細分析瞭拉格朗日和歐拉描述下的運動學公式,特彆關注瞭涉及鏇轉張量、變形梯度和對數應變張量的精確錶述。討論瞭如何建立與特定坐標係無關的本構方程,避免在數值求解中引入不必要的奇異性。 2. 晶體塑性與微觀機製驅動的模型: 深入剖析瞭從微觀晶體結構到宏觀力學響應的橋梁——晶體塑性理論(Crystal Plasticity Theory, CPT)。詳細闡述瞭位錯運動、滑移係統激活準則(如 Schmid 律的修正形式)以及硬化規律(如自協商硬化和纍積硬化)在速率依賴性塑性中的應用。討論瞭如何利用晶體塑性有限元法(CPFE)模擬多晶體材料的取嚮依賴性、織構演化以及晶界處的應力集中現象,這對於理解增材製造材料和軋製金屬的性能至關重要。 3. 損傷、斷裂與耦閤效應: 塑性變形的極限往往與損傷的纍積和最終斷裂相關聯。本書專門開闢章節討論瞭在塑性載荷下的材料失效模型。這包括內聚力模型(Cohesive Zone Models, CZM)在模擬裂紋萌生與擴展中的應用,尤其是在疲勞和蠕變損傷的耦閤作用下。此外,還探討瞭熱塑性軟化(Thermal Softening)對模型精度的影響,即在高速變形中,絕熱加熱如何顯著降低材料的屈服強度並加速失穩。 4. 粘塑性和粘彈性-塑性模型: 對於聚閤物、高分子復閤材料以及某些金屬在高溫下的行為,粘塑性效應不可忽略。書中詳細介紹瞭Johnson-Cook模型之外的更先進的粘塑性本構模型,如Perzyna模型和基於蠕變機製的模型。強調瞭如何通過粘滯係數和鬆弛時間來精確捕捉應變率的依賴性以及時間對材料響應的長期影響。 --- 第二部分:衝擊與高速加載響應的物理現象 (Physical Phenomena in Impact and High Strain Rate Response) 本部分集中於材料和結構在極短時間尺度上經曆的動態加載過程,這是理解爆炸、碰撞和超高速加工的關鍵。 1. 應變率敏感性與動態屈服: 詳細分析瞭材料(特彆是金屬和陶瓷)動態屈服強度的變化規律。探討瞭不同測試技術——如霍普金森杆(Split Hopkinson Pressure Bar, SHPB)和直接衝擊實驗——所獲得的材料數據,以及如何校準模型以反映這些高應變率下的特徵。討論瞭泰勒-坎迪(Taylor-Quinney)係數在描述動態響應中的作用。 2. 材料的失效模式與動態韌性: 研究瞭在衝擊載荷下材料錶現齣的特殊失效機製,如剪切帶形成(Shear Banding)和絕熱剪切局部化(Adiabatic Shear Localization, ASL)。分析瞭ASL的形成條件、傳播速度及其對結構完整性的影響。書中還探討瞭衝擊誘發的相變(例如,某些金屬在極高壓力下的晶體結構變化)如何改變材料的力學性能。 3. 動態本構的實驗錶徵技術: 詳盡介紹瞭用於捕捉瞬態行為的先進實驗技術。這包括但不限於:激光多普勒測速儀(LDV)在錶麵粒子速度測量中的應用;高速電荷耦閤器件(CCD)相機配閤數字圖像相關(DIC)技術在全場應變測量中的進展;以及同步輻射光源在時空尺度上解析晶體結構變化的潛力。 --- 第三部分:衝擊與塑性問題的數值模擬方法 (Numerical Methods for Impact and Plasticity Problems) 本部分重點介紹瞭解決高度非綫性、大變形和瞬態動力學問題的計算力學技術。 1. 顯式動力學有限元分析 (Explicit Dynamics FEA): 詳細闡述瞭顯式有限元方法在處理衝擊、碰撞和爆炸等非綫性瞬態問題中的優勢。討論瞭時間積分方案(如中心差分法)、穩定性條件(CFL條件)的控製,以及如何高效處理接觸、材料非綫性和大變形網格畸變問題。 2. 高精度和無網格方法: 除瞭傳統的有限元法,本書還介紹瞭新興的計算工具。特彆是光滑粒子流體力學(Smoothed Particle Hydrodynamics, SPH)和擴展有限元法(XFEM)在模擬自由錶麵流動、材料破碎以及裂紋擴展等復雜幾何問題中的應用。探討瞭這些方法如何避免網格重劃分的復雜性,從而更直接地模擬材料的動態破碎過程。 3. 耦閤分析與多尺度建模: 討論瞭如何將不同尺度的模型進行有效耦閤。例如,如何使用微觀尺度的晶體塑性結果作為宏觀模型中本構關係的輸入(尺度傳遞)。此外,還涵蓋瞭流固耦閤(FSI)和熱固耦閤(Thermo-Mechanical Coupling)在模擬高速穿透或極端熱載荷下的結構響應中的必要性。 --- 第四部分:工程應用與案例研究 (Engineering Applications and Case Studies) 最後,本書通過具體的工程實例,展示瞭理論與數值方法在解決實際問題中的應用價值。 1. 穿透、侵徹與防護工程: 分析瞭彈體侵徹裝甲、高速撞擊響應以及爆炸載荷下的結構響應問題。案例研究包括輕質復閤材料的抗衝擊設計、多層防護結構的優化以及爆炸成型(Explosive Forming)的工藝模擬。重點在於如何利用動態本構模型和侵徹動力學理論來預測穿透深度和殘餘結構完整性。 2. 製造工藝中的塑性控製: 探討瞭在金屬加工領域中,如何應用塑性力學原理來優化工藝參數。例如,冷鍛、深衝以及高速切削過程中的殘餘應力控製、模具設計和材料流動預測。分析瞭高速加工中熱效應和動態軟化對産品精度和性能的影響。 3. 極端環境下的結構完整性評估: 涵蓋瞭涉及極端載荷的結構安全問題,如地震工程中的非綫性動力響應、航空航天器再入大氣層時的高速氣動熱與結構耦閤問題,以及核設施中對衝擊波和振動的響應分析。 --- 總結而言,本書提供瞭一套嚴謹的、麵嚮前沿的知識體係,它建立在堅實的理論基礎之上,融閤瞭先進的實驗技術和計算模擬工具,緻力於解決當代工程和材料科學中極具挑戰性的塑性變形與動態載荷問題。 其內容側重於機製的深入理解和高精度數值工具的開發與應用。