TY - JOUR
T1 - Coupled Thermal-Mechanical Progressive Damage Model with Strain and Heating Rate Effects for Lightning Strike Damage Assessment
AU - Millen, S.L.J.
AU - Murphy, Adrian
AU - Catalanotti, Giuseppe
AU - Abdelal, Gasser
PY - 2019/11/11
Y1 - 2019/11/11
N2 - This paper proposes a progressive damage model incorporating strain and heating rate effects for the prediction of composite specimen damage resulting from simulated lightning strike test conditions. A mature and robust customised failure model has been developed. The method used a scaling factor approach and non-linear degradation models from published works to modify the material moduli, strength and stiffness properties to reflect the effects of combined strain and thermal loading. Hashin/Puck failure criteria was used prior to progressive damage modelling of the material. Each component of the method was benchmarked against appropriate literature. A three stage modelling framework was demonstrated where an initial plasma model predicts specimen surface loads (electrical, thermal, pressure); a coupled thermal-electric model predicts specimen temperature resulting from the electrical load; and a third, dynamic, coupled temperature-displacement, explicit model predicts the material state due to the thermal load, the resulting thermal-expansion and the lightning plasma applied pressure loading. Unprotected specimen damage results were presented for two SAE lightning test Waveforms (B {\&} A); with the results illustrating how thermal and mechanical damage behaviour varied with waveform duration and peak current.
AB - This paper proposes a progressive damage model incorporating strain and heating rate effects for the prediction of composite specimen damage resulting from simulated lightning strike test conditions. A mature and robust customised failure model has been developed. The method used a scaling factor approach and non-linear degradation models from published works to modify the material moduli, strength and stiffness properties to reflect the effects of combined strain and thermal loading. Hashin/Puck failure criteria was used prior to progressive damage modelling of the material. Each component of the method was benchmarked against appropriate literature. A three stage modelling framework was demonstrated where an initial plasma model predicts specimen surface loads (electrical, thermal, pressure); a coupled thermal-electric model predicts specimen temperature resulting from the electrical load; and a third, dynamic, coupled temperature-displacement, explicit model predicts the material state due to the thermal load, the resulting thermal-expansion and the lightning plasma applied pressure loading. Unprotected specimen damage results were presented for two SAE lightning test Waveforms (B {\&} A); with the results illustrating how thermal and mechanical damage behaviour varied with waveform duration and peak current.
KW - Progressive damage model
KW - Lightning strike
KW - Finite element analysis
KW - Composite damage
KW - Strain rate effects
KW - Heating rate effects
U2 - 10.1007/s10443-019-09789-z
DO - 10.1007/s10443-019-09789-z
M3 - Article
SN - 0929-189X
JO - Applied Composite Materials
JF - Applied Composite Materials
ER -