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基于线弹性断裂力学，探讨了聚合物粒子填充复合材料中的脆韧转变情况，提出了一个与聚合物材料的临界特征长度有关的脆韧转变判据rc／V~2_fc和rc／Vfc．对一定的填充粒子和聚合物共混体系，re／V2fc(或rc／Vfc）为一常数。
Based on the linear elastic fracture mechanics, the brittle-ductile transition in the polymer-particle-filled composites was discussed and a brittle-to-ductile transition criterion, rc / V ~ 2_fc and rc / Vfc, was proposed in terms of the critical characteristic length of the polymer material. For certain filled particle and polymer blend systems, re / V2fc (or rc / Vfc) is a constant.