In ISO 3471 ( Roll-over protective structures or ROPS ) there is a section regarding charpy v-notch testing. This section contains a table of charpy specimen size, test temperature, and energy requirement. The language in this section requires steel members to meet or exceed one of the charpy impact strengths in this table (there are 24 possible charpy energies). My first question is, what is suppose to drive the selection of test temperature? My second question is, what is the intent of leaving this open to the user/designer? My hope is to understand the logic behind this part of the specification, so that I can provide the correct product to my customer (who currently has no specific requirement for charpy test temperature).
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