本标准方案是1980年3月国际材料热处理联合会(International Federation of Heat Treatment and Surface Engineering)淬火冷却技术委员会(Technical Committee of Scientific and Technological Aspect of Quenching)在美国底特律会议...本标准方案是1980年3月国际材料热处理联合会(International Federation of Heat Treatment and Surface Engineering)淬火冷却技术委员会(Technical Committee of Scientific and Technological Aspect of Quenching)在美国底特律会议上所提出的(80-85)年工作计划中的一项研究任务,会议建议以英国伯明翰阿斯顿大学华福森热处理中心(Wolfson Heat Treatment Centre,The University of Aston in Birmingham,Birmingham,United Kingdom)和法国热处理技术协会和冶金学会联合委员会(Commission Mixte Association Technique de Traitment Thermique et Societe Francaise de Metallugie)分别建立的测试方法为依据,联合进行系列试验以确定推荐一种国际标准测试方法。试验结果经反复书面交换意见和会议讨论(译者就曾亲自参加了85.6在西柏林和88.9在芝加哥两次委员会的讨论),之后在86年10月乃责成工作组就华福森方案进行适当修改后报送瑞士国际标准组织(ISO)审批作为推荐国际标准方案。随又再度修改并由ISO新34国有关标准组织征求意见,要求充分考虑在各技术领域符合国家利益下进行投票,除8国因故未投票外,其余26国中18国赞同,2国反对和6国弃权,其中有5国提出建议,并在88,10,28日前送返ISO理事会,目前正在该会技术委员会秘书处进行校订和编制中即收成为淬火油冷速国际标准测试方法。展开更多
In order to find the test cube for industrial robots as specified by ISO 9283, a seed cube is grown up in an irregular working space of the robot, provided that the corners of the cube do not exceed the boundary of t...In order to find the test cube for industrial robots as specified by ISO 9283, a seed cube is grown up in an irregular working space of the robot, provided that the corners of the cube do not exceed the boundary of the working space. All possible cubes are searched, and the cube with the maximum volume is selected. The calculation examples show that the method of growth can be used for a variety of industrial robots. The method of growth can determine the test cube and test points of irregular working space according to ISO 9283, and can avoid blindness and randomness in the selection of test points.展开更多
In this paper, on the basis of the implementation of the national chemical industry standard analytical test methods and analysis of test items, a food additive quality analysis and inspection of network management ap...In this paper, on the basis of the implementation of the national chemical industry standard analytical test methods and analysis of test items, a food additive quality analysis and inspection of network management applications are developed using the development technology of Visual Basic language and computer system operating environment, to achieve a network management software for users on food additives of quality analytical testing. The software sets up an information sharing network platform for enterprise and quality management departments, which is a major innovation in the food additive quality analysis on test management methods and tools.展开更多
This paper presents a lumped mass model to describe the run-out and velocity of a series of large flume tests,which was carried out to investigate some propagation mechanisms involved in rapid,dry,dense granular flows...This paper presents a lumped mass model to describe the run-out and velocity of a series of large flume tests,which was carried out to investigate some propagation mechanisms involved in rapid,dry,dense granular flows and energy transformation when the flows encountered obstacles and reoriented their movement directions.Comparisons between predicted and measured results show that the trend of predicted velocities was basically matched with that of measured ones.Careful scrutiny of test videos reveals that subsequent particles with a higher velocity collided with slowed fronts to make them accelerate. However,this simple model cannot reflect collisions between particles because it treated released materials as a rigid block.Thus,the predicted velocity was somewhat lower than the measured velocity in most cases.When the flow changed its direction due to the variation in slope inclination,the model predicted a decrease in velocity.The predicted decrease in velocity was less than the measured one within a reasonable range of 10% or less.For some cases in which a convexity was introduced,the model also predicted the same trend of velocities as measured in the tests.The velocity increased greatly after the materials took a ballistic trajectory from the vertex of the convexity,and reduced dramatically when they finally made contact with the base of the lower slope.The difference between prediced and measured decrease in velocity was estimated to be about 5% due to the landing.Therefore,the simple lumped mass model based on the energy approach could roughly predict the run-out and velocity of granular flows,although it neglected internal deformation,intergranular collision and friction.展开更多
In this paper a critical review is presented of the history and current state of the art of J-integral resistance curve testing and experimental evaluation methods in conjunction with a discussion of the development o...In this paper a critical review is presented of the history and current state of the art of J-integral resistance curve testing and experimental evaluation methods in conjunction with a discussion of the development of the plane strain fracture toughness test standard ASTM E1820 developed by American Society for Testing and Materials (ASTM). Early research efforts on this topic are reviewed first. These include the J-integral concept, experimental estimates of the J-integral for stationary cracks, load line displacement (LLD) and crack mouth opening displacement (CMOD) based η factor equations, different formulations of J-integral incremental equations for growing cracks, crack growth corrected J-R curve determination, and experimental test methods. Recent developments in J-R curve testing and evaluation are then described, with emphasis on accurate J-integral incremental equations, a normalization method, a modified basic method, a CMOD direct method with use of incremental equations, relationships of plastic geometry factors, constraint-dependent J-R curve testing and correction approaches. An overview of the present fracture toughness test standard ASTM E1820-08a is then presented. The review shows that after more than 40 years of investigation and development, the J-integral resistance curve test methods in ASTM E1820 have become simpler, more cost-effective and more accurate.展开更多
文摘本标准方案是1980年3月国际材料热处理联合会(International Federation of Heat Treatment and Surface Engineering)淬火冷却技术委员会(Technical Committee of Scientific and Technological Aspect of Quenching)在美国底特律会议上所提出的(80-85)年工作计划中的一项研究任务,会议建议以英国伯明翰阿斯顿大学华福森热处理中心(Wolfson Heat Treatment Centre,The University of Aston in Birmingham,Birmingham,United Kingdom)和法国热处理技术协会和冶金学会联合委员会(Commission Mixte Association Technique de Traitment Thermique et Societe Francaise de Metallugie)分别建立的测试方法为依据,联合进行系列试验以确定推荐一种国际标准测试方法。试验结果经反复书面交换意见和会议讨论(译者就曾亲自参加了85.6在西柏林和88.9在芝加哥两次委员会的讨论),之后在86年10月乃责成工作组就华福森方案进行适当修改后报送瑞士国际标准组织(ISO)审批作为推荐国际标准方案。随又再度修改并由ISO新34国有关标准组织征求意见,要求充分考虑在各技术领域符合国家利益下进行投票,除8国因故未投票外,其余26国中18国赞同,2国反对和6国弃权,其中有5国提出建议,并在88,10,28日前送返ISO理事会,目前正在该会技术委员会秘书处进行校订和编制中即收成为淬火油冷速国际标准测试方法。
文摘In order to find the test cube for industrial robots as specified by ISO 9283, a seed cube is grown up in an irregular working space of the robot, provided that the corners of the cube do not exceed the boundary of the working space. All possible cubes are searched, and the cube with the maximum volume is selected. The calculation examples show that the method of growth can be used for a variety of industrial robots. The method of growth can determine the test cube and test points of irregular working space according to ISO 9283, and can avoid blindness and randomness in the selection of test points.
文摘In this paper, on the basis of the implementation of the national chemical industry standard analytical test methods and analysis of test items, a food additive quality analysis and inspection of network management applications are developed using the development technology of Visual Basic language and computer system operating environment, to achieve a network management software for users on food additives of quality analytical testing. The software sets up an information sharing network platform for enterprise and quality management departments, which is a major innovation in the food additive quality analysis on test management methods and tools.
基金supported by theopen fund project of Scientific Alleviation of Disasters and Home Rebuilding(Grant No.DZJK-0814)from the Chinese State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology
文摘This paper presents a lumped mass model to describe the run-out and velocity of a series of large flume tests,which was carried out to investigate some propagation mechanisms involved in rapid,dry,dense granular flows and energy transformation when the flows encountered obstacles and reoriented their movement directions.Comparisons between predicted and measured results show that the trend of predicted velocities was basically matched with that of measured ones.Careful scrutiny of test videos reveals that subsequent particles with a higher velocity collided with slowed fronts to make them accelerate. However,this simple model cannot reflect collisions between particles because it treated released materials as a rigid block.Thus,the predicted velocity was somewhat lower than the measured velocity in most cases.When the flow changed its direction due to the variation in slope inclination,the model predicted a decrease in velocity.The predicted decrease in velocity was less than the measured one within a reasonable range of 10% or less.For some cases in which a convexity was introduced,the model also predicted the same trend of velocities as measured in the tests.The velocity increased greatly after the materials took a ballistic trajectory from the vertex of the convexity,and reduced dramatically when they finally made contact with the base of the lower slope.The difference between prediced and measured decrease in velocity was estimated to be about 5% due to the landing.Therefore,the simple lumped mass model based on the energy approach could roughly predict the run-out and velocity of granular flows,although it neglected internal deformation,intergranular collision and friction.
文摘In this paper a critical review is presented of the history and current state of the art of J-integral resistance curve testing and experimental evaluation methods in conjunction with a discussion of the development of the plane strain fracture toughness test standard ASTM E1820 developed by American Society for Testing and Materials (ASTM). Early research efforts on this topic are reviewed first. These include the J-integral concept, experimental estimates of the J-integral for stationary cracks, load line displacement (LLD) and crack mouth opening displacement (CMOD) based η factor equations, different formulations of J-integral incremental equations for growing cracks, crack growth corrected J-R curve determination, and experimental test methods. Recent developments in J-R curve testing and evaluation are then described, with emphasis on accurate J-integral incremental equations, a normalization method, a modified basic method, a CMOD direct method with use of incremental equations, relationships of plastic geometry factors, constraint-dependent J-R curve testing and correction approaches. An overview of the present fracture toughness test standard ASTM E1820-08a is then presented. The review shows that after more than 40 years of investigation and development, the J-integral resistance curve test methods in ASTM E1820 have become simpler, more cost-effective and more accurate.
