断口呈脆性断裂特征。

Fracture of IPDB joints present brittle characteristic.

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断裂形貌考察表明，POM/ NBR共混物的断裂面呈脆性断裂特征；

The impact fracture surface showed a tough morphology for POM/NBR/Novolak blends and brittle one for POM/NBR blends.

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断口分析表明，随着测试温度的提高，韧窝逐渐变小，呈脆性断裂特征。

The dimples of composites fracture gradually decreases, exhibits brittle fracture, as the testing temperature increases.

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