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480篇 您的检索式:作者名="CLEGG J"
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1从微孔洞起始的热冲击裂纹的数值研究——Ⅰ:热应力分析显示文摘陶瓷材料在热冲击荷载作用下的典型破坏模式是裂纹的起始和扩展。当高温的材料或构件突然处于低温环境时 ,裂纹将由材料或构件的表面开始产生和发展。因此 ,材料表面及其表面附近的材料微结构对裂纹的起始有着非常重要的影响。实验表明 :某些具有微孔洞结构的陶瓷材料比相应的密实材料的抗热冲击性能有所提高 ,但相关的机制目前还没有得到定量的解释。本文作者利用商业有限元软件 ABAQUS,分析了受热冲击表面上的开口微孔洞、处于表面附近的闭口微孔洞周围的热应力场 ,以及微孔洞的大小、微孔洞与表面的距离对热应力场的影响 ,其目的是为进一步分析裂纹的起始和扩展做准备。数值结果表明 :一般情况下 ,闭口微孔洞引起的应力集中比开口微孔洞引起的应力集中更为严重 ,特别当闭口微孔洞与表面之间的距离很小时 ,和没有微孔洞情况相比 ,闭口微孔洞引起的最大的应力集中系数超过贺鹏飞 李京剑 Yuan C Stern R Clegg W J 2002复合材料学报2002,19,5:5
2从微孔洞起始的热冲击裂纹的数值研究——Ⅱ:能量释放率分析显示文摘利用商业的有限元软件 ABAQU S,分析了具有微孔洞结构氧化铝陶瓷材料在受到热冲击作用下 ,从处于材料表面上的开口微孔洞以及临近材料表面的闭口微孔洞的底部起始的裂纹扩展。结果表明 :对于从开口微孔洞和闭口微孔洞底部起始的裂纹 ,其能量释放率随冷却时间的变化规律类似 ,即随冷却时间 t由零开始增加 ,能量释放率也由零开始快速增大 ,在冷却时间大约为 t=0 .1s时 ,达到其最大值 ,随后开始降低。另外对于从开口微孔洞底部起始的裂纹 ,结果发现裂纹的能量释放率随裂纹长度的增加、微孔洞半径的增加而增加 ,而对于从闭口微孔洞底部起始的裂纹 ,其能量释放率随裂纹长度的增加、微孔洞半径的增加、以及微孔洞与材料受热冲击面距离的增加而增加。以开口微孔洞底部起始的裂纹为例 ,研究了裂纹与临近微孔洞之间的作用 ,发现临近微孔洞的存在可以明显减小裂纹的能量释放率。贺鹏飞 李京剑 Yuan C Stern R Clegg W J 2002复合材料学报2002,19,5:2
3The Impact of Inward FDI on the Performance of Chinese Manufacturing Firms显示文摘PETER J BUCKLEY JEREMY CLEGG CHENGQI WANG 2002Journal of Intema-tional Business Studies2002,33,4:1
4Treatment of rheumatoid arthritis with oral type Ⅱ collagen 显示文摘BARNETT M L KREMER J M CLEGG D O 1998Arthritis &Rheumatism1998,41,2:1
5Polymorphisms of the equine major histocompatibility complex class II DRA locus显示文摘Brown J J Thomson W Clegg P 2004Tissue Antigens2004,64,:1
6The Impact of In-ward FDI on the Performance of Chinese Manufacturing firms显示文摘BUCKLEY P J CLEGG J WANG C Q 2002Journal of International Business Studies2002,33,4:1
7Death, disability and dogma显示文摘Clegg J Lansdall Welfare R 2003Philosophy Psychiat and Psychol2003,10,1:1
8The polymeric structure of aquacadmium bisnicotinate显示文摘Clegg W Cressey J T McCamle A Straughan B P 0,,:1
9公司业绩主观措施的有效性显示文摘Wall T.D Michie J Patterson M Wood S.J. Sheehan M. Clegg C.W. & West M 2004人事心理学2004,,01:1
10Process optimisation for a squeeze cast magnesium alloy显示文摘Yong M S Clegg A J 2004Journal of Materials Processing Technology2004,145,1:1
11Obesity, insulin resistance and diabetes: Sex differences and role of oestrogen receptors 显示文摘Meyer M R Clegg D J Prossnitz E R 2011Acta Physiol (Oxf)2011,203,1:1
12Glucosamine, chondroitin sulfate, and the two in combination for painful knee osteoarthritis显示文摘Clegg DO Reda D J Harris CL 2006N Engl J Med2006,354,8:1
13An experimental method to study the frictional processes during composites manufacturing显示文摘Ersoy N Potter K Wisnom M R Clegg M J 2005Composites Part A: Applied Science and Manufacturing2005,36,11:1
14Is the relationship be- tween inward FD! and spillover effects linear? An empir- ical examination of the case of China 显示文摘Buckley P Clegg J Wang C 2007Journal of In- ternational Business Studies2007,38,3:1
15Inherited haemoglobin disorders: an increasing global health problem 显示文摘Weatherall D J Clegg JB 2001Bull World Health Organ2001,79,8:1
16The relationship between inward foreign direct investment and the performance of domestically-owned Chinese manufacturing industry显示文摘BUCKLEY P J CLEGG J WANG C 0,,03:1
17The impact of foreign ownership, local ownership and industry characteristics on spillover benefits from foreign direct investment in China 显示文摘Buckley P Wang C Clegg J 2007International Business Review2007,16,2:1
18Insulin and leptin combine additively to reduce food intake and body weigh in mt 显示文摘Air E L Benoit S C Clegg O J 2002Endocrinol2002,143,6:1
19Use of cardiac markers to assess the toxic effects of anthraeyclines given to children with cancer: a systematic review 显示文摘Bryant J Picot J Baxter L Levitt G Sullivan I Clegg A 2007Eur J Cancer2007,43,13:1
20Localization of the horse (Equus caballus) alpha-globn gene emplex to chromose 13 by fuorescence in situ hybridization显示文摘Oakenful E A Buckle J B Clegg J B 1993Cytogenet Cell Genet1993,62,:1
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