Pressure regarding the operating temperature of composite panels
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These past few days, I’ve encountered certain working conditions at work, and I’ve looked up the operating temperatures and pressures for composite materials. Generally, there are specified design temperatures for these composite sheets, which are either higher or lower than the design temperatures of the individual layers that make up the composite material. As for pressure, the maximum allowed value is 350 MPa. I’m wondering whether it’s possible to use these composite sheets in conditions of negative pressure, specifically at -0.1 pressure; and whether this would have any impact on the layers of the composite sheet.
Considering the negative pressure conditions, composite steel plates that meet 100% of the requirements can be used, and there should be no issues with that.
We used it at a pressure of -0.1 to 0.3 MPa, with steam as the medium, and B1 grade composite steel plates were employed
Do you conduct retests, and is the failure rate for those retests strictly 0%?
If there is a poor fit, it can easily lead to damage to the laminated layer in that area under vacuum conditions; it is best to use grade one materials.
We did not conduct a re-inspection; there is a quality certificate for the composite panel issued by the supplier, along with an ultrasonic testing report, giving a conformity rate of 100%
The quality certificate and ultrasonic testing report are provided by the supplier; we commissioned a third party to test the tensile strength, yield strength, and elongation after fracture of the coating layer.
The cover layer of B2/B2 is not included in the strength calculation, while that of grade B1 can be included; however, I think it is better not to include it either. Why do you test the strength and yield strength of the coating layer?
We have taken into account the strength of the cover layer; we tested it because it is a flat sheet made of S30408.