The effect of relative width of soft layer upon the J-integral values is investigated.
考察了软夹层相对宽度对J积分值的影响。
A path independent of the J-integral and the stress, strain on the crack tip are discussed.
讨论了J积分的路径无关性和裂尖应力，应变奇异性。
The virtual crack extension method has been utilized to simulate the J-integral of non-uniform welded joints.
采用虚拟裂纹扩展法对焊接接头力学不均匀体的断裂参量J积分进行了数值模拟分析。
The crack driving force parameter (J-integral) is calculated and analyzed using ANSYS software in this thesis.
本研究利用ANSYS有限元软件计算和分析裂纹驱动力参量J积分。
The general form of J-integral conservation law in three dimensions has been derived from the principle of virtual work.
本文由力学的普遍原理——虚功原理推导出了三维情况下J积分守恒的一般形式；
Using the method of J-integral with cantilever beam specimens, the environmental fracture process of structural steels was studied.
用悬臂梁j积分法研究了结构钢的环境断裂过程。
The J-integral fracture criterion based on HRR theory has been widely used in the studies of elastic-plastic fracture of materials.
在弹塑性断裂研究中广泛地采用着J积分断裂判据，这种判据的基础是HRR理论。近些年来，一些研究者基于数值分析和试验研究对HRR理论的适用性进行了讨论。
Therefore, it can be concluded that J-integral as controlling parameter used to estimate the safety of welded structures is not always valid.
因此，采用J积分作为用来预测焊接结构安全性的控制参量是不正确的。
By means of numerical calculation, the rules of J-Integral values varied with the length and depth of the inner surface crack of gun barrel were obtained.
通过数值计算，得出了身管内表面裂纹J积分值随裂纹长度及深度的变化规律。
The result shows that, as the crack stands on melt line of welded joint, the values of J-integral are different from those of both all-base and all-weld metal.
结果表明，无论是平面应变还是平面应力条件下，焊接接头J积分值都与全母材和全焊缝材料不同；
The differences of J-integral between CT specimens with and without loading holes have been compared and analyzed by means of incremental theory elastic - plastic finite element calculations.
通过增量理论弹塑性有限元计算，对比分析了带和不带加载孔ct试样J积分之间的差异。
The crack driving force in the bi-material is analyzed and the variations of J-integral with the bi-material parameters and the distance between crack and interface are studied in this thesis.
本研究对双相介质材料中的裂纹驱动力参量进行分析，研究J积分随双相界质材料特性的差异和裂纹到界面距离的变化规律。
As the fracture assessment method based on COD theory is replaced by the method based on J-integral theory, it is greatly required simple and convenient, reliable evaluation method of J-integral.
随着以COD理论为基础的断裂评定方法被以弹塑性J积分理论为基础的断裂评定方法所取代，在工程实际应用中迫切需要简便、可靠的J积分估算方法。
The main task of the system is to assess assembled vats, pressure vessels and rotation components by using COD and J-integral theory, and to assess large casting and forging components by FATT theory.
它的主要任务是对组合气缸、压力容器、旋转构件进行COD理论和J积分理论的评定，以及对大型铸锻构件进行断口形貌转变温度FATT的评定。
Moreover, the difference of J-integral values increases with the increasing of the load and strength mismatching difference and the path-enclosed length of interface between weld metal and base metal.
载荷越大，焊缝与母材的强度差别越大；积分路径中包含的焊缝与母材界面长度越大，J积分的差值越大。
MARC. Jetta car's connecting rod was analyzed. Through analysis, the curve between J integral and splitting force was established.
MARC软件对捷达轿车连杆起裂过程进行了数值分析，得出了裂解力与J积分的关系曲线。
J integral value related to the initiation of ductile crack is important material properties for the engineering structure of ductile fracture.
韧性裂纹开始扩展的J积分值对于韧性断裂的工程构件是一个重要的材料性能指标。
Finite element method was used to analyze the J integral evaluation method for a cylindrical specimen with deep circumferential crack under axial or torsional load.
通过有限元解析方法分别研究了轴向或扭转载荷下带环状裂纹圆棒试样的J积分的评价方法。
For the same sized cracks bigger diameter pipe material possesses larger KI and J integral value therefore bigger diameter pipe material is more sensitive to defects.
对于相同尺寸的裂纹，大管径材料具有较大的KI和J积分值，因此，大管径材料对缺陷更敏感。
The strength matching factor m has a great influence on the J integral in the vicinity of the crack tip.
焊接接头强度匹配因子m对裂纹尖端的J积分值有很大的影响。
A numerical simulation technology of fatigue life prediction of pressure vessel based on cyclic J - integral is developed.
开发了一种基于循环J积分的压力容器疲劳寿命预测的数值模拟技术。
The results showed the path independence of J integral of welded joint. It established the foundation of application of elastic plastic J integral in welded structures.
计算结果表明了焊接接头中J积分的路径无关性，并为焊接结构中弹塑性J积分的应用奠定了基础。
The J integral is path-independent for the short time creep and long one, while in the transition period, it is weakly path-dependent.
积分在短时蠕变和长时间蠕变条件下是路往无关的，而在过渡蠕变时期，其与路径也只是弱相关。
The J integral values in the vicinity of the crack tip in welded joints were numerically analyzed by using the plane stress elastic-plastic finite element method.
采用平面应力弹塑性有限元法研究了含有多部损伤的焊接接头裂纹尖端J积分的变化规律。
This paper presents a method for estimating the elastic-plastic dynamic J integral value by finite element analysis.
本文介绍用有限元估算弹塑性动态j积分值的方法。
So, it is doubtful to directly use the J -integral as a fracture criterion in heterogeneous welded joints.
因此，在非均质焊接接头中直接应用J积分作为断裂判据不合适。
Because the integral relates with the path, one special computer formula of J -integral is given in the last.
由于积分与路径有关，最后仅给出了一种特殊路径下j积分的计算公式。
The calculation method of 3D elastic - plastic J - integral by using finite element method was explored, meanwhile, some key questions and techniques were introduced.
探讨了用有限元法计算三维弹塑性J积分的方法，并就一些计算的关键问题和技巧作了分析。
(ZHANG D W, YANG H. Large integral bulkhead of titanium alloy forgings: isothermal local loading forming technology [J]. Forging & Pressing, 2012(21):32-38.
[18] 张大伟，杨合。大型钛合金整体隔框锻件：局部加载等温成型技术[J]。锻造与冲压，2012（21）：32-38。
(ZHANG D W, YANG H. Large integral bulkhead of titanium alloy forgings: isothermal local loading forming technology [J]. Forging & Pressing, 2012(21):32-38.
[18] 张大伟，杨合。大型钛合金整体隔框锻件：局部加载等温成型技术[J]。锻造与冲压，2012（21）：32-38。
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