The sharp brittle-tough transition is observed at a critical interparticle distance when the content of elastomer is relatively high.
当弹性体的含量高到一定程度，分散相的粒间距达到临界值，则发生明显的脆韧转变。
For the UPR with greater brittleness, the brittle-tough transition was observed only when the toughness of the resin was characterized by fracture toughness at a slower loading rate.
对于脆性较大的UPR，只有在采用加载速度较慢的断裂韧性来表征其韧性时，方能观察到这一脆韧转变现象。
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