Stress transfer from polymerization shrinkage of a chemical-cured composite bonded to a pre-cast composite substrate.
Stress transfer from polymerization shrinkage of a chemical-cured composite bonded to a pre-cast composite substrate.
复制标题
粘合到预制复合材料基材上的化学固化复合材料的聚合收缩产生的应力转移。
DOI：
10.1016/s0109-5641(98)00016-5
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Ferracane,JL
中科院分区：
文献类型：
--
作者：
Sakaguchi,RL;Ferracane,JL
目的：（1）开发和测试基于应变计的方法，用于评估通过粘合界面传递到可变形基底的应变;以及（2）开发和测试有限元（FE）模型，用于评估聚合期间化学固化复合材料中的应力发展。方法：使用普通光固化树脂复合材料制作一个矩形板，其内部有一个填充化学固化复合材料的槽。在通道中的复合材料的表面上和在邻近通道-板界面的板上的应变计用于在混合复合材料浆料之后连续记录应变长达500秒。四分之一的三维（3D）有限元模型使用的渠道上测量的应变来模拟实验条件。该模型被用来估计在通道和粘接界面的应力。结果：复合材料混合后200 s应变达到平台。通道中的复合浆料的应变随时间继续上升，但以稳定的下降速率。有限元模型预测的最大主应力在板顶部、通道顶部和通道内分别为5.12MPa、3.78MPa和5.26MPa。重要性：应力有效地转移通过粘结界面在这个测试配置，结果与以前报道的文献值聚合收缩应力在复合材料的配置具有类似的粘结到未粘结的表面比。
Objectives: (1) To develop and test a strain gauge-based method for evaluating the strain transferred through a bonded interface to a deformable substrate; and (2) to develop and test a finite element (FE) model for evaluating the stress development in a chemical-cured composite during polymerization. Methods: A generic light-cured resin composite was used to fabricate a rectangular plate with an internal slot filled with a chemical-cured composite. Strain gauges on the surface of the composite in the channel and on the plate adjacent to the channel-plate interface were used to record strain continuously up to 500s after mixing the composite paste. A quadrant three-dimensional (3D) finite element model used strains measured on the channel to simulate the experimental conditions. The model was used to estimate stresses in the channel and at the bonded interface. Results: Strain in the plate reached a plateau 200s after mixing the composite. Strain of the composite paste in the channel continued to rise with time but at a steadily decreasing rate. Maximum principal stress predicted by the FE model on top of the plate, on top of the channel and within the channel was 5.12MPa, 3.78MPa, and 5.26MPa, respectively. Significance: Stresses were effectively transferred through the bonded interface in this test configuration, and results were in close agreement with previously reported literature values for polymerization contraction stresses generated in composite configurations with similar bonded to unbonded surface ratios.