水稻颗粒中心首先形成应力裂纹的可能性最大。
The fissuring of rice is more likely to be initiated at the center of the kernel.
同时，稀土使合金的热裂纹形成温度降低，增加了热裂纹形成应力，降低了合金的热裂倾向性。
Moreover, they are able to decrease the temperature and increase the stress of hot cracking formation, as a result, decrease the tendency of hot cracking.
结果表明：空气氧化处理碳纤维表面形成微孔和刻蚀沟槽，容易形成应力集中，复合材料的强度不高；
Gas-phase oxidation treatment resulted in distrihution of some micro-pores and ditches at the carbon fiber surface and led to stress concentration therefore, the composite strength was not high.
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