Improper rework practices can result in unscheduled maintenance or surface damage that causes crack initiation.

翻修不当可能会造成非计划性维修和表面损伤从而造成裂纹。

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While installation, transport and other industrial accidents of the petroleum pipeline, it is unavoidable to encounter various damage and defect, such as surface flaw, crack, etc.

石油管线在安装与油气输运过程以及其他工业事故中，难免会产生各种各样的损伤和缺陷，如出现表面凹坑、裂纹等。

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Introducing the initial damage parameters of coal surface obtained by digital image processing in model, got the failure process corresponding stress state under the crack initiation and expansion.

将数字图像处理煤体表面得到的初始损伤参数引入所建立的模型中，得到了相应受力状态下的裂纹起裂、扩展破坏过程。

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