TY - JOUR
T1 - Experimental evaluation of mode I fracture toughness of dissimilar-material joints with thermal residual stresses
AU - Harada, Kazuki
AU - Jespersen, Kristine Munk
AU - Shima, Momoka
AU - Hosoi, Atsushi
AU - Kawada, Hiroyuki
PY - 2022
Y1 - 2022
N2 - The mode I interlaminar fracture toughness of dissimilar-material joints with thermal residual stresses is experimentally evaluated. The double cantilever beam (DCB) test is commonly used to assess the interlaminar fracture toughness of composites but is inadequate when dissimilar materials are joined owing to the mixed mode, which arises from differences in the bending stiffness and the thermal residual stresses formed during manufacturing because of differences in the linear expansion coefficient of the adherends. To address these difficulties, a new test, named the constant-load DCB test, was developed to evaluate the mode I interlaminar fracture toughness. In this study, a testing machine, based on the theoretical method previously established to derive the mode I interlaminar fracture toughness of dissimilar-material joints, is manufactured, and the fracture toughness is experimentally determined. As a result, good agreement between the theoretical value and experimental results is obtained, and the mode mixity ratio is significantly decreased compared with that of the general DCB test.
AB - The mode I interlaminar fracture toughness of dissimilar-material joints with thermal residual stresses is experimentally evaluated. The double cantilever beam (DCB) test is commonly used to assess the interlaminar fracture toughness of composites but is inadequate when dissimilar materials are joined owing to the mixed mode, which arises from differences in the bending stiffness and the thermal residual stresses formed during manufacturing because of differences in the linear expansion coefficient of the adherends. To address these difficulties, a new test, named the constant-load DCB test, was developed to evaluate the mode I interlaminar fracture toughness. In this study, a testing machine, based on the theoretical method previously established to derive the mode I interlaminar fracture toughness of dissimilar-material joints, is manufactured, and the fracture toughness is experimentally determined. As a result, good agreement between the theoretical value and experimental results is obtained, and the mode mixity ratio is significantly decreased compared with that of the general DCB test.
KW - Carbon fibers
KW - Fracture toughness
KW - Residual stress, mode I
U2 - 10.1016/j.compscitech.2022.109459
DO - 10.1016/j.compscitech.2022.109459
M3 - Journal article
SN - 0266-3538
VL - 224
JO - Composites Science and Technology
JF - Composites Science and Technology
M1 - 109459
ER -