Shakedown and ratcheting analysis of Printed Circuit Heat Exchangers under multiple cyclic mechanical and thermal loads

Printed Circuit Heat Exchangers (PCHEs) is a kind of compact plate heat exchanger with lot fine channels in solid block, called PCHE core. It can withstand high temperature and pressure. And beyond that, it has many advantages, such as exchange efficiency, low pressure drop, compactness, good corrosion resistance, long service life other advantages. However, PCHEs will endure complex mechanical thermal loads service. Meanwhile, shakedown ratcheting assessment, especially how to determine boundary for an efficient accurate way, still intractable problem so far. This article makes deep research analysis subjected cyclic load combinations well the effect channel shape size effects based on linear matching method (LMM). The influences parameters, e.g. difference between hot cold channels, geometric radii, shapes, arrangement transition radius local corner semicircular channel, were all discussed detail. Based these different types influence two-dimensional boundaries kinds models under mechanical-thermal are presented this paper. demonstrated that differences have significant effect, but radii not significant. Core observed responses significantly, however, shows more than limit boundary. core arrangement, i.e. total number position, also found constant loading case. series LMM results, be concluded accumulative incremental plastic strain occur at region when combination exceeds limit, which should strict control. results from current parametric studies effective reference design optimization diffusion bonded nuclear applications.