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基于DYNAFORM叶轮前盖板拉伸成形的数值模拟研究
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作者 袁昕 孔繁余 +1 位作者 沈小凯 陈凯 《中国农村水利水电》 北大核心 2015年第10期133-135,140,共4页
基于板料成形有限元分析软件DYNAFORM,对不同厚度的叶轮前盖板拉伸成形进行数值模拟,分析板料在不同厚度下的应力、厚度、压边力变化情况。结果表明:板料的相对厚度t/D越大,危险区域所受的应力越小,对拉伸有利;在板料拉伸过程中,压边力... 基于板料成形有限元分析软件DYNAFORM,对不同厚度的叶轮前盖板拉伸成形进行数值模拟,分析板料在不同厚度下的应力、厚度、压边力变化情况。结果表明:板料的相对厚度t/D越大,危险区域所受的应力越小,对拉伸有利;在板料拉伸过程中,压边力的平衡状态不随板料厚度变化而变化,基本保持一稳定的值。叶轮前盖板拉伸成形研究对冲压泵制造具有一定的指导意义。 展开更多
关键词 DYNAFORM 数值模拟 叶轮前盖板拉伸 成形厚度 变化 厚度变化 压边力变化
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China-Japan Security Relations and China's Countermeasures
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作者 Meng Xiaoxu 《Contemporary International Relations》 2017年第3期89-112,共24页
Security relations are crucial in China-Japan relations. Since the"nationalization"of the Diaoyu Islands by Japan in 2012, mutual trust between China and Japan has been declining, and bilateral security rela... Security relations are crucial in China-Japan relations. Since the"nationalization"of the Diaoyu Islands by Japan in 2012, mutual trust between China and Japan has been declining, and bilateral security relations have reached a low point. China-Japan security relations are typified by ongoing dispute over the Diaoyu Islands, lack of mutual trust exacerbated by various actions by Japan, and the delay of China-Japan security dialogues. The evolution of China-Japan security relations derived from the Diaoyu Islands dispute is clearly beyond the scope of the dispute itself, with deep-rooted internal and external factors. In the near future,China-Japan security relations will face more challenges than opportunities. China should take measures, including enhancing mutual trust in politics and security between the two countries, to impose necessary pressure on Japan to change course, to win over neighboring countries so as to avoid pretext for Japan's intervention in regional issues,and to strengthen interpersonal communication and understanding between people of the two countries in order to stabilize security relations. 展开更多
关键词 mutual trust on security Abe administration security relations China-Japan relations
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