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�������պ����ѧѧ�� 2004, Vol. 30 Issue (08) :783-786    DOI:
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1. �������պ����ѧ ���տ�ѧ�빤��ѧԺ, ���� 100083;
2. �й����������о�Ժ���������о���, �ɶ� 610003
Effects of defects on the tensile strength of rigid polyurethane foamed plastics
Lu Zixing1, Shi Shanglu1, Wang Jianhua2*
1. School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics�� Beijing 100083, China;
2. Institute of Chemical Materals, Chinese Academy of Engineering Physics, Chengdu 610003, China

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Abstract�� The tensile tests have been done for different densities polyurethane rigid foam (PURF) specimens with and without defects. On the basis of experiments, the strength of PURF is investigated and the effects of defect with different kind and different size on the ultimate strength of PURF are discussed at the same time. The result of experiments shows that the tensile strengths of PURF specimens stored in a long time (about 6 years) have not been changed and they are proportional to the square of relative densities of PURF. It also found that the form of defects has significant effects on the tensile strength of PURF and if the defects of specimens have the shape of an arc, they have significant size effect of defects on their tensile strengths.
Keywords�� foamed plastics   mechanical properties   defects   tensile test     
Received 2003-04-16;
Fund:

NSAF���ϻ���������Ŀ(10276004);������Ȼ��ѧ����������Ŀ(10072007)

About author: ¬����(1960-),��,�ӱ���ǿ��,����, luzixing@263.net.
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¬����, ʯ��·, ������.ȱ����ʽ����ĭ��������ǿ�ȵ�Ӱ��[J]  �������պ����ѧѧ��, 2004,V30(08): 783-786
Lu Zixing, Shi Shanglu, Wang Jianhua.Effects of defects on the tensile strength of rigid polyurethane foamed plastics[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(08): 783-786
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2004/V30/I08/783
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