本文研究的材料為聚甲基丙烯酸甲酯(PMMA)，俗稱壓克力。目的在探討一含裂縫之PMMA平板，受張裂型負載模式(Mode I)時，在不同溫度條件下，裂縫成長方向的概率。為了更貼近不同溫度時的材料性質，故採用ANSYS非線性分析中的多線性模型，以多段直線來逼近實際的應力應變曲線。並選用隨動性硬化規則(Kinematic Hardening)來進行模擬。在不同溫度條件下，以裂縫尖端附近之塑性區發展範圍及塑性應變量或應力狀態為考量的參數，使用不同的概率方程式，計算各角度裂縫成長的相對概率。
隨著溫度的增加，材料由脆硬轉變成具有延展性，在不同的應力權重放大因子 ，及塑性應變權重放大因子 之下，相對概率最大值發生之角度亦有所不同，但大多數的情況仍以0°角度方向成長為主。

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