通过静力分析得到了微进给刀具系统在静力作用下的变形和应力分布。

The stiffness and stress distribution of the micro-feeding system are obtained through static analysis.

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结果表明，焊缝金属中存在的非金属夹杂物，在低应力作用下形成微裂纹成为裂源，加之焊缝组织中存在大量的M A结构群，从而发生焊缝金属在室温下的解理断裂。

The results showed that nonmetallic inclusions in weld seam served as crack initiation site under external bend load, and large amount of m a structure resulted in cleavage fracture of weld seam.

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同时现有抗裂砂浆的抗裂性仍然较差，在应力作用下会出现数量较多的微裂缝。

Meanwhile, the crack resistance of present crack-resistance mortar is still a poor, a certain amount micro-cracks are produced under stress.

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