Thermal autofrettage of dissimilar material brazed joints. (15th February 2015)

• Record Type: Journal Article
• Authors: Hamilton, Niall Robert; Wood, James; Easton, David; Robbie, Mikael Brian Olsson; Zhang, Yuxuan; Galloway, Alexander
• Is Part Of: Materials & design. Volume 67(2015:Mar.)
• Page Start: 405
• Page End: 412
• Publication Date: 2015-02-15
• Subjects: Thermal autofrettage -- Residual stresses -- Finite element analysis -- X-ray diffraction -- Validation; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2014.11.019
• Languages: English
• ISSNs: 0264-1275

Abstract

Highlights: The beneficial effects of cryogenic thermal autofrettage on residual stresses in a dissimilar joint is shown. Desirable constitutive material characteristics are highlighted. FE simulations are validated with experimental residual stress measurements using X-ray diffraction. Abstract: This paper presents a study on the effects of thermal autofrettage on the residual stresses in a Titanium–Copper brazed joint. It is shown that cryogenic thermal autofrettage has the potential to alter the residual stress field due to joining, in a manner that should result in an improvement in the subsequent operational fatigue performance of dissimilar material joints. Beneficial change in the residual stress field in the less-ductile component of the joint is apparent and desirable constitutive characteristics of the braze material to enhance the final residual stress field are also highlighted. Results from the finite element simulations are validated using experimental residual stress measurements produced using X-ray diffraction. The characteristics of the process and the findings of the work presented should also be relevant to dissimilar material joints manufactured by other processes.