Influencing factors on local stress-strain responses of notched specimen 缺口件局部应力-应变关系影响因素的研究
Fatigue crack propagation of the notched specimen under cyclic compression-compression loading based on the Two-parameter unified approach 基于双参数统一方法研究压&压疲劳下的裂纹扩展
Stress and modal analyses of an ultrasonic vibration system, consisting of a notched specimen and one or two amplifying horns have been performed by using3D finite element calculation. 简述了超声疲劳试验机的工作原理以及应用超声疲劳试验技术研究工程结构材料疲劳裂纹扩展性能的实验方法。
The results show that the temperature has greater effect on the smooth specimen than on the notched specimen. The stress field intensity approach can verify the relationship between the rotary bending limit and torsion fatigue limit. 结果表明:温度对光滑试样比对缺口试样的影响大,运用应力强法可以较好地验证旋转弯曲疲劳极限与扭转疲劳极限的关系。
Dynamic Elastic-Plastic FEM Analysis of a Circumferentially Notched Specimen with Different Curvature Radius at the Top of Notch 切口尖端不同曲率半径试件的动态有限元分析
The results indicate that fine grain steel has a higher toughness in notched specimen as compared with coarse grain steel over a temperature range from-196 ℃ to-30 ℃. 结果发现:在-196~-30℃范围内,细晶钢的缺口断裂韧性显著高于粗晶钢;
Study on fatigue crack initiation site of notched tubular specimen under biaxial loading 双轴加载下缺口疲劳裂纹萌生位置的研究
An Analysis of Ductile Damage by Micromechanics for Notched Specimen 带缺口圆试棒的韧性损伤细观力学分析
The main features of the approach are ① an independent damage characterization method, Damage Data Structure, DDS, ② a New failure criterion& Damage influence ( DI) criterion for notched specimen. 包括:①提出了一种不依赖具体分析方法的统一的损伤记录与表征方法损伤数据结构DDS;②提出了一种全新的缺口强度破坏判据损伤影响(DI)破坏判据;
Influence of Consecutive Loading-unloading Cycles to Rock K_ ( IC) and "Plasticity" Correction of Rock K_ ( IC) from Straight Notched Specimen 反复加卸载对岩石K(IC)的影响以及直切日试件岩石K(IC)的塑性修正
The cleavage facture stress of notched specimen is much higher than that of smooth specimen. 切口试样测得的解理断裂应力明显高于光滑试样。
Fracture toughness of alumina matrix ceramics measured by indentation method and single edge notched beam specimen techniques were analyzed and contrasted, and the most suitable indentation method equation was confirmed. 用压痕法和单边切口梁法测量了氧化铝基陶瓷材料的断裂韧性,对这两种方法所测得的结果进行了分析对比,确定了最适用的压痕法计算公式。
On the basis of elastic-plastic finite element analysis for tubular specimen, the stress-strain state in the critical position for notched specimen was analyzed and calculated by the proposed finite element model, and then the obtained results were used to predict the multiaxial fatigue life of notched specimens. 在此基础上,对缺口件危险点处应力应变状态进行了分析和计算,并利用此分析结果对缺口件进行寿命预测。
Chevron-Notched Specimen and Method for Measuring Fracture Toughness of Brittle Materials 脆性材料断裂韧性测定的山形缺口试件和方法
Research on Fatigue Crack Formation of Notched Specimen 缺口件疲劳裂纹形成特性研究
The formulae of stress concentration factor of annular notched specimen under tensile load are obtained by means of least-square method based on accurate solution in specific case and numerical solution in common case. 根据特殊情况下的精确解和一般情况下的数值结果,利用最小二乘法,拟合了拉伸载荷下具有环形切口圆杆的应力集中系数的计算公式。
A Suggested Method for Fatigue Total Life Prediction of Notched Specimen 含缺口试件疲劳全寿命预测一种建议的方法
Based on the author and his co-workers 'recent double-edge notched mode ⅱ fracture, a relative new non-notched specimen for mode ⅱ fracture is suggested in this paper. 本文基于作者及其合作者近年新提出的两端切口Ⅱ型断裂试件几何和相应的应力强度因子公式的基础上,建议一种无切口Ⅱ型断裂试件。
Hydrogen embrittlement index ( 1%) of welds and heat affected zone ( HAZ) of C-Mn steel welded joints are studied by means of smooth and notched tensile specimen. 用光滑和缺口拉伸试件,对C-Mn钢的焊态和焊接热影响区的热模拟态进行氢脆敏感性指数的研究,并进行了金相与断口的SEM,TEM,AES的微区分析。
Influence of loading rate on stress and strain distribution a notchs in front of in notched specimen 加载速率对缺口前应力、应变分布的影响
The fatigue life of a notched specimen under random loading spectrum is evaluated by means of the present method. 用该方法分析了一个缺口试件在随机谱载下的裂纹形成寿命,结果比常规的有效系数和雨流法更接近试验结果。
As for notched specimen, the fatigue life prediction using fatigue factors of half-life section is the smallest. 对于缺口疲劳试样,则采用半寿命阶段的疲劳参数的预测结果为最小。
By analyzing the local stress and strain of the notched specimen with a centre hole subjected to monotonic and cyclic loading using 3-D elasto-plastic finite element, the multiaxial mechanical responses of the notched specimen as well as their changes with the nominal stress ( amplitudes) were investigated. 通过对单调和循环加载下中心孔缺口试样的3-D有限元数值模拟,研究了缺口多轴局部应力、应变响应及其随名义应力(幅)的变化规律;
Effects of laser treating of notched specimen on its fatigue life 切口试件的激光处理对其疲劳寿命的影响
Influence of pre-strain on fracture behavior of notched specimen of alloy steel with different graininess 预应变对不同晶粒度合金钢缺口试样断裂行为的影响
For notched specimen, the critical event of cleavage fracture determined by ferrite grain size is the propagation of a grain-sized crack into a neighboring grain. 对于缺口试样,铁素体晶粒尺寸对材料的解理断裂起决定性作用,临界事件是:铁素体晶粒尺寸的微裂纹扩展进入相邻的铁素体晶粒中。
Traditional methods for fatigue total life prediction of notched specimen model fatigue process with completely different methods for two stages of crack nucleation and growth of cracks to final failure with no quantitative relationships between them. 传统的研究含缺口构件的疲劳的方法是将疲劳启裂和疲劳裂纹扩展两个过程完全独立起来,用不同的方法来模拟,相互间并没有定量的关系。
Most of the shear bands nucleate at the notch tips, and distribute in the clockwise ( or anticlockwise) direction. The number of shear bands initiated in the notched specimen is much less than that in the un-notched specimen. 结果表明:绝大多数剪切带都在缺口尖端形核,并且呈顺时针(或逆时针)的螺旋花样,有缺口试样剪切带数量比无缺口试样中剪切带数量小很多。
The characteristics of the 3D stress intensity factor is still being explored, so the study of 3D stress intensity factor is very necessary. Firstly, a single edge notched specimen is chosen as the sample to study, its finite element model and mesh are created. 因此对三维应力强度因子的研究十分必要。本文以单边直裂纹试样为研究对象,进行了有限元建模和网格的划分。
Based on fracture computed and analyzed four methods, finite element software is used to model two dimension double edge notched specimen and stress intensity factors of crack tip are calculated. At the same time, the accuracies of different methods under different mesh are compared. 基于此四种计算分析方法,利用有限元软件建立二维双边直裂纹试样模型,计算裂纹尖端的应力强度因子,比较在裂纹尖端附近不同精度网格条件下不同计算方法的精确度。