Abstract
Aiming at the carbon fiber reinforced plastics (CFRP) of poor electrical conductivity which will lead to thermal stress damage due to intense Joule effect under lightning strikes, electro-thermal-structure coupling models of CFRP lightning strikes were established. By analyzing the thermal strain, thermal stress and status of the modified and unmodified CFRP, their thermal expansion characteristics were compared. Compared with the unmodified CFRP, the thermal strain peak value of the modified CFRP is respectively increased by 36.33%, 53.92%, 66.62%, and the thermal stress peak value of them is respectively reduced by 22.63%, 26.53%, and 9.45% in the absence of dielectric breakdown. But in the breakdown state, both specimens appear complete delamination damage, the protective effect of matrix modification becomes invalid. The thermal stress damage is found having little effect on the damage morphology of the specimens after lightning strikes by comparing their CT images.
Highlights
Composite material is the pioneer of aerospace structural material, and carbon fiber reinforced polymer (CFRP) is in the rapid development stage of application research
Where δ is the thermal strain; a is the coefficient of thermal expansion; l is the initial size of the material; ΔT
The electro-thermal-structural coupling simulation study on thermal expansion delamination damage of unprotected and matrix modified protective specimens caused by lightning current is carried out
Summary
Composite material is the pioneer of aerospace structural material, and carbon fiber reinforced polymer (CFRP) is in the rapid development stage of application research. In the past, even if the aircraft was struck by lightning, the probability of safe survival of aircraft was very high; as resin-based composite materials are more and more widely used in aircraft, their short plates with poor electrical conductivity are gradually exposed, making it easier to suffer injury for aircraft to survive lightning[7]. The modification of composite resin matrix by graphene, carbon nanotubes, silver powder and nickel plated carbon fiber powder is a new idea for lightning protection of composite materials. This paper is based on the electrical thermal structure coupling Methods: the delamination damage effect of matrix modified composites caused by thermal stress during lightning stroke was studied
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