Temperature Distribution and Thermal Stresses

摘要

An investigation was made to extend the existing knowledge of thermal stresses in ship structures by the study of both physical and mathematical models. The physical floating model was a 10-ft welded box beam simulating the main hull girder of a transversely framed cargo ship. It was subjected to various temperature environments above water, and thermal stresses were measured with foil strain gages. The results of these tests showed excellent agreement at sections remote from the ends of the model with a strength-of-materials approach modified to include any arbitrary transverse temperature distribution. A finite-difference solution to the governing equations of thermo-elasticity was developed for two-dimensional plates and extended to a folded-plate type of box girder. The solution was conducted on the IBM 704 and 7090 computers, and the computer program with sight modification is considered suitable for use in ship-design offices. Solutions were obtained for a variety of thermal conditions with temperatures varying vertically, transversely, and longitudinally. Accurate comparisons were made with both the experimental and the strength-of-materials results. (Author)