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模袋混凝土抗裂性能影响因素分析与评价 被引量:5
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作者 丁亚楠 娄宗科 《水电能源科学》 北大核心 2018年第7期92-94,82,共4页
为分析模袋混凝土抗裂性能的影响因素,采用极限拉伸试验,以极限拉伸值和轴向抗拉强度作为混凝土抗裂能力的评价指标,研究等强度条件下粉煤灰掺量、含气量及粗骨料体积分数对其抗裂性能的影响规律。通过对比试验,探讨模袋布对混凝土抗裂... 为分析模袋混凝土抗裂性能的影响因素,采用极限拉伸试验,以极限拉伸值和轴向抗拉强度作为混凝土抗裂能力的评价指标,研究等强度条件下粉煤灰掺量、含气量及粗骨料体积分数对其抗裂性能的影响规律。通过对比试验,探讨模袋布对混凝土抗裂性能的影响。结果表明,等强度条件下,粉煤灰掺量增加,混凝土的轴向抗拉强度和极限拉伸值提高;混凝土的轴向抗拉强度和极限拉伸值与含气量之间呈"中间高,两边低"的变化规律;混凝土的轴向抗拉强度和极限拉伸值与粗骨料体积分数呈单调递减趋势。模袋混凝土试件破坏时,其轴向抗拉强度和极限拉伸的峰值大约为素混凝土的1.1、1.3倍;模袋混凝土的极限变形能力提高,模袋布显著改善了混凝土的综合抗裂性能。研究成果可为模袋混凝土抗裂性能的理论完善提供试验数据和理论依据。 展开更多
关键词 极限拉伸试验 模袋混凝土 轴向抗强度 极限 抗裂能力
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Formability of the AMS 5596 Sheet in Comparison with EDDQ Steel Sheet
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《Journal of Mechanics Engineering and Automation》 2014年第1期72-77,共6页
Some materials form better than others, moreover, a material that has the best formability for one stamping may behave very poorly in a stamping of another Configuration. The forming limit of a metal sheet is generall... Some materials form better than others, moreover, a material that has the best formability for one stamping may behave very poorly in a stamping of another Configuration. The forming limit of a metal sheet is generally given in terms of the limiting principal strains under different loading conditions and represented by the so-called FLD (forming limit diagram). In view of the difficulty to experimentally determine the forming limits, many researchers have sought to predict FLD. The formability of sheet metal has frequently been expressed by the value of strain hardening exponent and plastic anisotropy ratio. The stress-strain and hardening behaviour of a material is very important in determining its resistance to plastic instability. For these reasons, extensive test programs are often carried out in an attempt to correlate material formability with value of some mechanical properties. In this study, mechanical properties and the FLD of the AMS 5596 sheet metal was determined by using uniaxial tensile test and Marciniak's flat bottomed punch test respectively. 展开更多
关键词 Sheet metal FORMABILITY limit strain strain hardening plastic anisotropy.
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