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 damage variable 损伤变量(183)损伤变量的(37)
 损伤变量
 For two-dimensional plane stress problem, the relationship between macroscopic damage variable and the averaged microcrack density parameter for concrete under biaxial tension stress is presented based on the equivalence hypothesis of energy dissipation. 对二维平面应力问题,根据能量耗散等价假设,即当产生微裂纹所需能量等于形成损伤所需的能量时,细观损伤状态等价于宏观损伤状态,建立了单轴拉伸与双轴拉伸情况下混凝土宏观损伤变量与细观损伤参数(微裂纹密度)的关系。 短句来源 in the first chapter, we introduce the basic theory、 basic assumption、 damage variable、 mesoscopic and Gurson model. 在第一章中,主要阐述了损伤力学基本原理、基本假设、损伤变量、以及细观力学的研究方法,和研究细观损伤的Gurson模型; 短句来源 Constitutive energy and dissipation energy in material deformation are analyzed. Dissipation energy is calculated according to cycling loading test. A formula of damage definition in theory is suggested,and the calculation method of damage variable is given as well. 基于对材料变形中的本构能及耗散能的认识,依据循环加载计算耗散能,从能量耗散角度定义材料的损伤变量,并给出了损伤变量的理论计算公式及损伤阈值的确定方法,研究了相关试验结果的损伤扩展规律。 短句来源 By a series of pulsating cyclic tests of 16MnR steel under stress control at elevated temperature,transformation laws of the damage variable were measured at different maximum stresses at the same temperature and different temperature at the same maximum stress. 通过16MnR钢在中温应力控制条件下的脉动循环试验,测出在相同温度、不同最大应力以及相同最大应力、不同温度下的损伤变量变化规律. 短句来源 Under unsymmetrical cyclic loading, it has been proposed that taking the multiplication product of plastic strain range and elastic strain range Δε_p·Δε_e as the computing parameter of stress and strain, taking the dimension ɑ of small cracks as the damage variable, and adopting the material constants commonly used in engineering as the material parameters, thus established the small cracks expanding rate equation of calculating fatigue damage of elastoplastic materials and the estimation formula of life Noi. 提出了在非对称循环加载下,用塑性应变范围同弹性应变范围的乘积ΔpεΔeε作为应力应变的计算参量,用小裂纹尺寸a作为损伤变量,采用工程常用的材料常数作为材料参数,从而建立计算弹塑性材料疲劳损伤的小裂纹扩展速率方程式及各个历程的寿命Noi估算式。 短句来源 更多
 损伤变量的
 Constitutive energy and dissipation energy in material deformation are analyzed. Dissipation energy is calculated according to cycling loading test. A formula of damage definition in theory is suggested,and the calculation method of damage variable is given as well. 基于对材料变形中的本构能及耗散能的认识,依据循环加载计算耗散能,从能量耗散角度定义材料的损伤变量,并给出了损伤变量的理论计算公式及损伤阈值的确定方法,研究了相关试验结果的损伤扩展规律。 短句来源 The measurement of the high-cycle fatigue damage variable and the study of the damage evolutional law 高周疲劳损伤变量的测试和损伤演变规律的研究 短句来源 On the basis of damage variable and the theory of fractal,size effect of concrete strength is discussed quantitatively. 在此基础上定义了一种新的损伤变量 ,运用损伤变量的概念 ,结合分形学理论 ,定量的探讨了混凝土强度的尺寸效应 ; 短句来源 The concept of damage variable is extended from material to members and structures in the paper. 将损伤变量的概念从材料领域拓展到结构中,并用其作为损伤因子来表征结构的损伤程度。 短句来源 A new damage softening constitutive model for rocks is developed based on a new form of damage variable which is defined with rock micro-unit strength. 结合岩石微元强度提出了损伤变量的新形式,据此建立了新的岩石损伤软化本构模型. 短句来源 更多
 “damage variable”译为未确定词的双语例句
 The relationship between acoustic emission(AE) parameters and damage variable is obtained by applying the damage theory and microelement statistical strength theory. 由损伤力学理论与微元强度统计理论 ,得到了岩石声发射参数与损伤参量的关系。 短句来源 In this paper,a new fatigue damage variable was defined based on Lemaitre's strain equivalent hypothesis and a new fatigue criterion of asphalt mixtures was brought forward based on fatigue damage development process. 根据Lemaitre应变等效假设,定义沥青混合料疲劳损伤参量,并在分析沥青混合料疲劳损伤过程的基础上,定义新的疲劳破坏标准。 短句来源 On the basis of the continuum fatigue damage theory, a new nonlinear fatigue damage cumulative model is proposed by the defined fatigue damage variable by means of the varying behavior of the material ductility in the process of fatigue damage. 首先在连续疲劳损伤理论的基础上，根据疲劳损伤过程中金属材料韧性的变化特点，建立一种新的非线性疲劳损伤累积模型。 短句来源 By a series of pulsating cyclic tests of 16MnR under stress control at 420℃, equivalent modulus is selected to define damage variable, whose monotonic and irreversible decline can reflect both damage of cyclic creep and fatigue. At last, stress fatigue damage evolution of 16MnR at 420℃ are given. 针对16MnR钢420℃应力控制的脉动循环试验,选取“等效模量”来描述循环蠕变和疲劳的综合作用,得到16MnR钢420℃循环蠕变疲劳交互作用损伤演化估算表达式。 The model about the relationship among AE parameters,damage variable and strain is derived by applying the damage theory and micro-element statistical strength theory. 本文运用损伤理论和微元强度统计理论导出了声发射参数与损伤参量及应变的关系模型。 短句来源 更多

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 damage variable
 The damage variable introduced in damage mechanics quantifies the deviation of a brittle solid from linear elasticity. The constitutive equation and an evolution equation of the damage variable were applied to the DCB model. The main aspect of the proposed model is the definition of an internal damage variable which is appended as a factor of the internal energy and is then able to describe a progressive degradation of an isotropic hardening modulus. damage variable, is universally defined as the failure probability of the material due to the initiation and growth of the microscopically damaged regions. In addition, the crack measurements offer a way to provide a physical basis for a scalar damage variable. 更多
 Looking back to the concepts on the damage variable and effective stress,it is shown that the fomulation of the effective stress, as stipulated by L.M. KACHANOV [1], is merely a formula of the 1 st-order approximation.A new set compatible damage variable and effective stress are then proposed and extended to the 3-dimensional case. 在回顾了损伤变量和有效应力的概念后,指出了由Kachanov理论引入的有效应力表达式的近似性.建议了一组相容的损伤变量和有效应力,并且推广到三维情形. The basic concepts of anisotropic damage mechanics for composites are explained in detail.Both Lemaittre's model based on the hypothesis of strain equivalence and Coderbois' model on elastic energy indentification are introduced and discussed herein.The anisotropic damage factor and the damage variable under one-dimensional condition are redefined from the starin equivalence hypothesis. And two expressions for the damage energy release rate are derived from the both models above mentioned and the... The basic concepts of anisotropic damage mechanics for composites are explained in detail.Both Lemaittre's model based on the hypothesis of strain equivalence and Coderbois' model on elastic energy indentification are introduced and discussed herein.The anisotropic damage factor and the damage variable under one-dimensional condition are redefined from the starin equivalence hypothesis. And two expressions for the damage energy release rate are derived from the both models above mentioned and the difference between these two expressions is also shown. 本文讨论了各向异性损伤力学的基本概念并介绍了以应变等效性假设为基础的Lemaitre模型和以能量等效性假设为基础的Cordebois模型。在此基础上作者导出了两种损伤模型的损伤能释放率的表达式。文中作者定义了一维损伤时弹性材料板单元的一些损伤定义,并导出了两种模型在一维损伤时损伤能释放率Y_2的简单表达式,从而为复合材料层板损伤测量的实验研究提供了理论基础, In this paper, the stress deformation constitutive relations for continua are discussed and a stress deformation constitutive relation expressed by functional tensorial expression is found. When we study the anisolropic damage of anisotropic materials either from a macroscopic continuum mechanics model or from a micro-defect model, there exists a limitation to the order of a damage tensor, and the condition under which the damage variable may be described by a tensor lower than those of the highest order... In this paper, the stress deformation constitutive relations for continua are discussed and a stress deformation constitutive relation expressed by functional tensorial expression is found. When we study the anisolropic damage of anisotropic materials either from a macroscopic continuum mechanics model or from a micro-defect model, there exists a limitation to the order of a damage tensor, and the condition under which the damage variable may be described by a tensor lower than those of the highest order is found 本文首先讨论了较为广泛的连续介质材料的应力变形本构关系,得到了通常以泛函表示的应力变形本构关系的张量表达式.以此为基础,研究了各向异性材料各向异性损伤时,无论从连续介质力学模型出发还是从缺陷模型出发,描述损伤的张量都存在最高阶次的限制;指出了在什么条件下,损伤变量可用低于最高阶次的张量来描述。 << 更多相关文摘
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