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首页> 外文会议>International ASTM/ESIS symposium on fatigue and fracture mechanics >Modeling of Surface Crack Advance in Round Wires Subjected to Cyclic Loading
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Modeling of Surface Crack Advance in Round Wires Subjected to Cyclic Loading

机译：圆线循环载荷的表面裂纹预先建模

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This paper shows the evolution of the surface crack front in round bars constituted of different materials (determined by the exponent m of the Paris law), subjected to fatigue tension loading (with free ends) or fatigue bending loading. To this end, a numerical modeling was developed on the basis of a discretization of the crack front (characterized with elliptical shape) and the crack advance at each point perpendicular to such a front, according to a Paris-Erdogan law, using a three-parameter stress intensity factor (SIF). Each analyzed case was characterized by the evolution of the semielliptical crack front, studying the progress with the relative crack depth a/D of the following three key variables: (i) crack aspect ratio a/b (relation between the semiaxes of the ellipse which defines the crack front); (ii) maximum dimensionless SIF; and (iii) minimum dimensionless SIF.
机译：本文显示了由不同材料构成的圆形条（由巴黎法的指数M确定）的表面裂纹前沿的演变，经受疲劳张力载荷（具有自由端）或疲劳弯曲载荷。为此，根据巴黎埃尔多安法律，基于裂缝前部（特征在于椭圆形形状）的离散化，根据巴黎 - 埃尔多安法律，在垂直于这样的前线的每个点处的裂缝提前进行数值建模。参数应力强度因子（SIF）。每个分析的案例的特征在于半椭圆形裂缝前沿的演变，研究了以下三个关键变量的相对裂纹深度A / D的进展：（i）裂缝纵横比A / B（椭圆形的半X之间的关系定义裂缝前面）; （ii）最大无量纲SIF; （iii）最小无量纲SIF。

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