TY - JOUR
T1 - Effects of transient dynamic loading on the energy absorption capability of composite bolted joints undergoing extended bearing failure
AU - Feser, Thomas
AU - Hassan, Jazib
AU - Waimer, Matthias
AU - O'Higgins, Ronan M.
AU - McCarthy, Conor T.
AU - Toso, Nathalie
AU - Voggenreiter, Heinz
AU - McCarthy, Michael A.
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/9/1
Y1 - 2020/9/1
N2 - Carbon fibre reinforced polymer (CFRP) materials are widely used in transport aircraft. Crashworthiness requirements demand sufficient energy absorption capacity, especially in the fuselage structure. In a recently-proposed approach, specifically-designed “tension absorber” joints utilize tension loads for energy absorption via progressive bearing failure. For further development of the concept, experimental tests are performed on pin- joints in quasi-isotropic CFRP material, under transient dynamic loading at 3 m/s. Investigated parameters are laminate thickness, stacking sequence and pin diameter, and the results are evaluated using the performance parameters ultimate bearing strength, mean crush stress and mass-specific energy absorption. A strong relation between the ratio of pin diameter to laminate thickness, D/t, and the performance parameters is found. Compared to previous results for quasi-static loading, the ultimate bearing strength is increased whereas the mean crush stress and mass-specific energy absorption are reduced. Digital image correlation and computed tomography analysis reveals the mechanisms behind the observed trends. The results provide a basis for further optimization of energy-absorbing joints and validation of finite element models.
AB - Carbon fibre reinforced polymer (CFRP) materials are widely used in transport aircraft. Crashworthiness requirements demand sufficient energy absorption capacity, especially in the fuselage structure. In a recently-proposed approach, specifically-designed “tension absorber” joints utilize tension loads for energy absorption via progressive bearing failure. For further development of the concept, experimental tests are performed on pin- joints in quasi-isotropic CFRP material, under transient dynamic loading at 3 m/s. Investigated parameters are laminate thickness, stacking sequence and pin diameter, and the results are evaluated using the performance parameters ultimate bearing strength, mean crush stress and mass-specific energy absorption. A strong relation between the ratio of pin diameter to laminate thickness, D/t, and the performance parameters is found. Compared to previous results for quasi-static loading, the ultimate bearing strength is increased whereas the mean crush stress and mass-specific energy absorption are reduced. Digital image correlation and computed tomography analysis reveals the mechanisms behind the observed trends. The results provide a basis for further optimization of energy-absorbing joints and validation of finite element models.
KW - Composite bolted joints
KW - Energy absorption
KW - High strain-rate testing
KW - Progressive bearing failure
UR - http://www.scopus.com/inward/record.url?scp=85085598115&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2020.112476
DO - 10.1016/j.compstruct.2020.112476
M3 - Article
AN - SCOPUS:85085598115
SN - 0263-8223
VL - 247
JO - Composite Structures
JF - Composite Structures
M1 - 112476
ER -