Tensile and fracture behavior of polymer foams
Tensile and fracture behavior of polymer foams
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DOI：
10.1016/j.msea.2006.05.133
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发表时间：
2006-08-15
期刊：
影响因子：
6.4
通讯作者：
Jeelani, S.
中科院分区：
文献类型：
--
作者：
Kabir, Md. E.;Saha, M. C.;Jeelani, S.
研究了交联聚氯乙烯（PVC）和硬质聚氨酯（PUR）泡沫塑料的拉伸和Ⅰ型断裂行为。拉伸试验使用棱柱形杆试样进行，模式I断裂试验使用三点弯曲下的单边缺口弯曲（SENB）试样进行。测试样品由具有三种密度和两种不同交联水平的PVC泡沫和具有一种密度的PUR泡沫制备。使用Zwick/Rowell试验机进行拉伸和准静态断裂试验。动态断裂试验使用DYNATUP 8210型仪表落塔试验在三个不同的冲击能量水平下进行。研究了试样尺寸、加载速率、泡沫密度、交联度、裂纹长度、泡孔取向（流动方向和上升方向）和固体聚合物材料等各种参数。研究发现，泡沫密度和固体聚合物材料对聚合物泡沫的拉伸强度、模量和断裂韧性有显著影响。还发现聚合物交联水平对断裂韧性具有显著影响。上升和流动方向以及加载速率上的裂纹的存在具有最小的影响。动态断裂行为被发现是不同的，相比准静态断裂行为。动态断裂韧性（K-d）随冲击功的增大而增大。断裂表面的检查表明，对于所有泡沫材料，断裂以相当脆的方式发生。(c)2006 Elsevier B. V.保留所有权利。
Tensile and mode-I fracture behavior of cross-linked polyvinyl chloride (PVC) and rigid polyurethane (PUR) foams are examined. Tension tests are performed using prismatic bar specimens and mode-I fracture tests are performed using single edge notched bend (SENB) specimens under three-point bending. Test specimens are prepared from PVC foams with three densities and two different levels of cross-linking, and PUR foam with one density. Tension and quasi-static fracture tests are performed using a Zwick/Rowell test machine. Dynamic fracture tests are performed using a DYNATUP model 8210 instrumented drop-tower test set up at three different impact energy levels. Various parameters such as specimen size, loading rate, foam density, cross-linking, crack length, cell orientation (flow and rise-direction) and solid polymer material are studied. It is found that foam density and solid polymer material have a significant effect on tensile strength, modulus, and fracture toughness of polymer foams. Level of polymer cross-linking is also found to have a significant effect on fracture toughness. The presence of cracks in the rise- and flow direction as well as loading rate has minimal effect. Dynamic fracture behavior is found to be different as compared to quasi-static fracture behavior. Dynamic fracture toughness (K-d) increases with impact energy. Examination of fracture surfaces reveals that the fracture occurs in fairly brittle manner for all foam materials. (c) 2006 Elsevier B.V. All rights reserved.