为分析光学平面面形偏差,以直径100mm光学平晶为检测对象,利用斐索干涉仪采集了被测光学平面的波面干涉图,按照美国材料与试验协会(American Society for Testing and Materials,ASTM)标准方法,通过分析,能够定性反映出被测光学平面的...为分析光学平面面形偏差,以直径100mm光学平晶为检测对象,利用斐索干涉仪采集了被测光学平面的波面干涉图,按照美国材料与试验协会(American Society for Testing and Materials,ASTM)标准方法,通过分析,能够定性反映出被测光学平面的面形偏差。计算并分析了波面偏差指标峰谷值PV和均方根值RMS,将计算结果与利用ZYGO斐索干涉仪测得的数据对比,偏差为10-3λ,符合光学检测要求。综合考虑可操作性和计算精度,这种基于ASTM的方法是一种行之有效的光学检测分析方法。展开更多
依据ASTM G 48E法对SUP13Cr材质的临界点蚀温度进行测定,并对不同温度的点蚀规律进行了研究,对三种CPT检测方法进行了讨论。实验结果表明使用该方法无法测出该材质的临界点蚀温度,通过不同温度的E法实验发现在0~20℃时材料腐蚀以点蚀为...依据ASTM G 48E法对SUP13Cr材质的临界点蚀温度进行测定,并对不同温度的点蚀规律进行了研究,对三种CPT检测方法进行了讨论。实验结果表明使用该方法无法测出该材质的临界点蚀温度,通过不同温度的E法实验发现在0~20℃时材料腐蚀以点蚀为主,点蚀坑深度逐渐增大,壁厚方向减薄不明显;30~40℃时点蚀和均匀腐蚀同时存在,由于壁厚减薄量开始增大,点蚀坑深度变浅,点蚀速率急剧增大;温度大于50℃时完全转变为均匀腐蚀,点蚀坑消失,壁厚减薄量达到最大。展开更多
This paper is a review of the past research of mechanical testing methods for natural fibre honeycomb sandwich structure as well as failure modes analysis at a microscopic level by using Scanning Electron Microscope (...This paper is a review of the past research of mechanical testing methods for natural fibre honeycomb sandwich structure as well as failure modes analysis at a microscopic level by using Scanning Electron Microscope (SEM). As the world is garnering attention towards renewable resources for environmental purposes, studies of natural fibre have been increasing as well as the application of natural fibre throughout various industries such as aerospace, automobiles, and construction sectors. This paper is started with brief information regarding the honeycomb sandwich structure, introduction to natural fibre, its applications as well as the factors affecting the performances of the structure. Next, the mechanical testing methods are listed out as well as the expected outcomes obtained from the respective testing. The mechanical properties are also identified by conducting lab tests according to the ASTM standard for sandwich and core structures. The microstructure of the deformed samples is then examined under Scanning Electron Microscope (SEM) by using different magnifications to study the failure mechanisms of the samples. The images obtained from the SEM test are analyzed by using fractography which will show the failure modes of the samples. This article is based on past research conducted by professional on the related topic.展开更多
探讨了冲击测试标准ASTM D 5420的测试原理,并重新演绎平均失效能量的计算公式,提出了一种更易理解的计算方法。该研究基于样品冲击失效能量均一稳定的假设,修正了原计算方法;同时分析了测试标准用于蜂窝夹层结构冲击性能表征中的要素,...探讨了冲击测试标准ASTM D 5420的测试原理,并重新演绎平均失效能量的计算公式,提出了一种更易理解的计算方法。该研究基于样品冲击失效能量均一稳定的假设,修正了原计算方法;同时分析了测试标准用于蜂窝夹层结构冲击性能表征中的要素,包括支撑方式、失效判据、能量梯度和计算原理。结果表明:该研究所提出的计算方法步骤更为简单高效,结果更为准确,且在蜂窝夹层结构冲击失效能计算中,更加合理;同时解决了蜂窝夹层结构冲击测试中的部分问题,有利于蜂窝夹层结构冲击试验标准的建立和该材料体系抗冲击性能的表征。展开更多
在石油天然气行业制造企业中,取得API(美国石油协会)产品会标规范的装备必须符合API产品标准,API产品标准中对冲击试验方法的标准引用一般为ASTM A 370。本文通过对ASTM A 370-17a《钢制品力学试验的标准试验方法和定义》与GBT229-2007...在石油天然气行业制造企业中,取得API(美国石油协会)产品会标规范的装备必须符合API产品标准,API产品标准中对冲击试验方法的标准引用一般为ASTM A 370。本文通过对ASTM A 370-17a《钢制品力学试验的标准试验方法和定义》与GBT229-2007《金属材料夏比摆锤冲击试验方法》标准的对比和分析,介绍了两者的区别和联系,从试样要求、试验设备、试验程序以及试验结果等方面进行了阐述,对试样尺寸、摆锤刀刃、试验温度等有较大差异的因素进行了详细的说明,明确了两者的差异,确定了试验过程中的关注点。展开更多
文摘为分析光学平面面形偏差,以直径100mm光学平晶为检测对象,利用斐索干涉仪采集了被测光学平面的波面干涉图,按照美国材料与试验协会(American Society for Testing and Materials,ASTM)标准方法,通过分析,能够定性反映出被测光学平面的面形偏差。计算并分析了波面偏差指标峰谷值PV和均方根值RMS,将计算结果与利用ZYGO斐索干涉仪测得的数据对比,偏差为10-3λ,符合光学检测要求。综合考虑可操作性和计算精度,这种基于ASTM的方法是一种行之有效的光学检测分析方法。
文摘依据ASTM G 48E法对SUP13Cr材质的临界点蚀温度进行测定,并对不同温度的点蚀规律进行了研究,对三种CPT检测方法进行了讨论。实验结果表明使用该方法无法测出该材质的临界点蚀温度,通过不同温度的E法实验发现在0~20℃时材料腐蚀以点蚀为主,点蚀坑深度逐渐增大,壁厚方向减薄不明显;30~40℃时点蚀和均匀腐蚀同时存在,由于壁厚减薄量开始增大,点蚀坑深度变浅,点蚀速率急剧增大;温度大于50℃时完全转变为均匀腐蚀,点蚀坑消失,壁厚减薄量达到最大。
文摘This paper is a review of the past research of mechanical testing methods for natural fibre honeycomb sandwich structure as well as failure modes analysis at a microscopic level by using Scanning Electron Microscope (SEM). As the world is garnering attention towards renewable resources for environmental purposes, studies of natural fibre have been increasing as well as the application of natural fibre throughout various industries such as aerospace, automobiles, and construction sectors. This paper is started with brief information regarding the honeycomb sandwich structure, introduction to natural fibre, its applications as well as the factors affecting the performances of the structure. Next, the mechanical testing methods are listed out as well as the expected outcomes obtained from the respective testing. The mechanical properties are also identified by conducting lab tests according to the ASTM standard for sandwich and core structures. The microstructure of the deformed samples is then examined under Scanning Electron Microscope (SEM) by using different magnifications to study the failure mechanisms of the samples. The images obtained from the SEM test are analyzed by using fractography which will show the failure modes of the samples. This article is based on past research conducted by professional on the related topic.
文摘探讨了冲击测试标准ASTM D 5420的测试原理,并重新演绎平均失效能量的计算公式,提出了一种更易理解的计算方法。该研究基于样品冲击失效能量均一稳定的假设,修正了原计算方法;同时分析了测试标准用于蜂窝夹层结构冲击性能表征中的要素,包括支撑方式、失效判据、能量梯度和计算原理。结果表明:该研究所提出的计算方法步骤更为简单高效,结果更为准确,且在蜂窝夹层结构冲击失效能计算中,更加合理;同时解决了蜂窝夹层结构冲击测试中的部分问题,有利于蜂窝夹层结构冲击试验标准的建立和该材料体系抗冲击性能的表征。
文摘在石油天然气行业制造企业中,取得API(美国石油协会)产品会标规范的装备必须符合API产品标准,API产品标准中对冲击试验方法的标准引用一般为ASTM A 370。本文通过对ASTM A 370-17a《钢制品力学试验的标准试验方法和定义》与GBT229-2007《金属材料夏比摆锤冲击试验方法》标准的对比和分析,介绍了两者的区别和联系,从试样要求、试验设备、试验程序以及试验结果等方面进行了阐述,对试样尺寸、摆锤刀刃、试验温度等有较大差异的因素进行了详细的说明,明确了两者的差异,确定了试验过程中的关注点。
