建立一种测定裂纹尖端前应变分布的金相方法

Metallography Pub Date : 1989-09-01 DOI:10.1016/0026-0800(89)90013-X

L.G. Luo , A. Ryks , J.D. Embury

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引用次数: 7

摘要

采用金相方法测定了平面应变(中段)和平面应力(表面)条件下钝裂尖端前方的应变分布，以及平面应力条件下锐裂尖端前进的应变分布。材料为HSLA钢，经过两种处理:控制轧制，形成晶粒直径为8 μm的细晶组织;在热模拟热影响区结构的条件下(直径33 μm的粗晶粒)。对于平面应变和平面应力条件下测试的钢，钝化裂纹尖端前的应变分布可以表示为λ = 0.14 ((XCTOD)(−0.64)，其中X是与移动裂纹尖端的距离，CTOD是裂纹尖端张开位移。结果表明，尖裂纹前缘的应变分布可以用λ = 0.75exp(−38X)表示。

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On the development of a metallographic method to determine the strain distribution ahead of a crack tip

A metallographic method was used to determine the strain distribution ahead of a blunted crack tip under plane strain (midsection) and plane stress (surface) conditions as well as an advancing sharp crack tip under plane stress conditions. The material used was an HSLA steel in two treatments: after controlled rolling, which produced a fine-grained structure with grains 8 μm in diameter; and in a condition that thermally simulated a heat-affected zone structure (a coarse-grain size, 33 μm in diameter).

The strain distribution ahead of a blunted crack tip can be expressed as $ϵ = 0.14 ((X CTOD)^{(−0.64)}$ where X is the distance from the moving crack tip, and CTOD is the Crack Tip Opening Displacement, for the steel tested under both plane strain and plane stress conditions.

It was determined that the strain distribution ahead of an advancing sharp crack tip can be expressed by ϵ = 0.75exp(−38X).

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Metallography

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