This paper investigates the reliability-based design of composite laminates for hydrogen tanks at cryogenic environments. Large residual strains developed due to thermal mismatch between matrix and fibers result in matrix cracking at cryogenic temperatures and increased hydrogen leakage through the tank wall. First, the effects of temperature dependent material properties, allowing partial ply failure (matrix cracking), and reduced axial loads on tank wall achieved by auxiliary stiffening mechanisms are investigated by deterministic designs. Reliability-based optimizations are performed to quantify the effect of the uncertainties in composite material properties on the optimum thickness. The paper explores effects of uncertainties in different parameters to identify those that have the largest influence on the optimum design and quantify the weight penalty associated with level of uncertainty in those parameters. Studies of weight and reliability tradeoffs indicate that the most cost-effective measure of reducing thickness may be quality control.
Reliability, weight, and cost tradeoffs in the design of composite laminates for cryogenic environments
2001
15 Seiten, 18 Quellen
Conference paper
English
British Library Conference Proceedings | 2001
|Deterministic and Reliability-based Optimization of Composite Laminates for Cryogenic Environments
British Library Conference Proceedings | 2000
|