TY - JOUR
T1 - Investigation of transverse residual stresses in a thick pultruded composite using digital image correlation with hole drilling
AU - Yuksel, Onur
AU - Baran, Ismet
AU - Ersoy, Nuri
AU - Akkerman, Remko
PY - 2019
Y1 - 2019
N2 - Process induced residual stresses are one of the main sources of defects such as (pre) mature matrix cracking during pultrusion of fiber reinforced polymer composite profiles. Recently, comprehensive process models have been developed to understand and describe the underlying mechanisms of the residual stresses in pultrusion processes. The predicted stresses however have not been validated with experimental measurements which are necessary to verify the implemented material models and assumptions in the process models. A hole drilling method with digital image correlation (DIC) is used in the present work to measure the transverse strain relaxation due to material removal in a pultruded thick composite profile (20 × 20 mm) made of unidirectional glass/polyester. The corresponding residual stress state is back calculated using the measured strains in a finite element based numerical model. The estimated level of transverse residual stress in the core of the profile was found to be 6.1 MPa in tension.
AB - Process induced residual stresses are one of the main sources of defects such as (pre) mature matrix cracking during pultrusion of fiber reinforced polymer composite profiles. Recently, comprehensive process models have been developed to understand and describe the underlying mechanisms of the residual stresses in pultrusion processes. The predicted stresses however have not been validated with experimental measurements which are necessary to verify the implemented material models and assumptions in the process models. A hole drilling method with digital image correlation (DIC) is used in the present work to measure the transverse strain relaxation due to material removal in a pultruded thick composite profile (20 × 20 mm) made of unidirectional glass/polyester. The corresponding residual stress state is back calculated using the measured strains in a finite element based numerical model. The estimated level of transverse residual stress in the core of the profile was found to be 6.1 MPa in tension.
KW - B. Residual/internal stress
KW - C. Finite element analysis (FEA)
KW - Digital image correlation (DIC)
KW - E. Pultrusion
KW - Hole drilling
UR - http://www.scopus.com/inward/record.url?scp=85065652779&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2019.110954
DO - 10.1016/j.compstruct.2019.110954
M3 - Article
AN - SCOPUS:85065652779
VL - 223
JO - Composite Structures
JF - Composite Structures
SN - 0263-8223
M1 - 110954
ER -