Impact test temperature of the material and temperature of ductile-brittle transition
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Question: What is the relationship between the temperature for impact testing of materials and the temperature of ductile-brittle transition?
I’m not sure – is it reasonable for the material standards to specify an impact test temperature of -40°C, with the ductile-to-brittle transition temperature also set at no higher than -40°C?
The impact test temperature is -40, so the ductile-brittle transition temperature should be much lower than that
Can’t figure it out. It seems that the temperature for impact testing of materials should be higher than the ductile-brittle transition temperature... Below is a screenshot of 11.4.9.3 in GB150.4-2011; will it help with understanding?
Thank you for your guidance. Can it be understood that if the temperature requirement for the impact test is -40°C, then the temperature at which brittleness is observed in the material’s drop-weight test should be **below -40°C**?
If the design requires an impact test temperature of -40°C, and at the same time demands that the toughness-fragility temperature determined by the drop hammer test not exceed -40°C, then is this requirement for the drop hammer test meaningless?
The drop hammer test is conducted at a series of temperature values
I took a look at the standards for the drop hammer test; it involves a series of tests to determine the ductile-brittle transition temperature. The value obtained as a result of these tests is surely lower than the impact test temperature required under normal conditions, right?
The ductile-brittle transition temperature is a physical property of the material. The impact test is determined by one’s own standards; the ductile-brittle transition temperature should be lower than the temperature used in the impact test (of course, provided that the material can meet the requirements for testing at such low temperatures)
Yes, the impact test temperature specified in the design drawings is the same as the ductile-brittle transition temperature; I think there’s no point in conducting this drop hammer test.