标准编号：ISO 26843:2015
中文名称：金属材料 用预制裂纹夏比试片在冲击载荷率下测量断裂韧性
英文名称：Metallic materials — Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces
发布日期：2015-12
标准范围
This International Standard specifies requirements for performing and evaluating instrumentedprecracked Charpy impact tests on metallic materials using a fracture mechanics approach. Minimumrequirements are given for measurement and recording equipment such that similar sensitivity andcomparable measurements are achieved.Dynamic fracture mechanics properties determined using this International Standard are comparablewith conventional large-scale fracture mechanics results when the corresponding validity criteria aremet. Because of the small absolute size of the Charpy specimen, this is often not the case. Nevertheless,the values obtained can be used in research and development of materials, in quality control, and toestablish the variation of properties with test temperature under impact loading rates.Fracture toughness properties determined through the use of this International Standard may differfrom values measured at quasistatic loading rates. Indeed, an increase in loading rate causes a decreasein fracture toughness when tests are performed in the brittle or ductile-to-brittle regimes; the oppositeis observed (i.e. increase in fracture toughness) in the fully ductile regime. More information on thedependence of fracture toughness on loading (or strain) rate is given in Reference . In addition, it isgenerally acknowledged that fracture toughness also depends on test temperature. For these reasons,the user is required to report the actual test temperature and loading rate for each test performed.In case of cleavage fracture of ferritic steels in the ductile-to-brittle transition region, variability canbe very large and cannot be adequately described by simple statistics. In this case, additional tests arerequired and the analysis is to be performed using a statistical procedure applicable to this type of test,see for example Reference
立即下载标准文件