Cure Cycle Optimization for the Reduction of Processing-Induced Residual Stresses in Composite Materials
- 1 December 1993
- journal article
- research article
- Published by SAGE Publications in Journal of Composite Materials
- Vol. 27 (14) , 1352-1378
- https://doi.org/10.1177/002199839302701402
Abstract
The control and reduction of processing-induced residual stresses has been investigated by modifying processing conditions for a graphite/BMI composite material. The effects of dwell temperature, dwell time, cool-down rate, cool-down pres sure, and postcure on residual stresses were investigated using unsymmetric cross-ply laminates. The effects on transverse mechanical properties were also measured. Experi mental results have shown that residual stresses can be reduced by as much as 25-30% while retaining or enhancing transverse mechanical properties by curing at lower tempera tures for longer times or utilizing an intermediate low-temperature dwell in three-step cure cycles. Overall process cycle times are not lengthened for three-step curing.Keywords
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