Exposure of structural epoxy adhesive to combination of tensile stress and γ-radiation

Experimental and Theoretical Study of Gamma Radiolysis and Dose Rate Effect of o-Cresol Formaldehyde Epoxy Composites

“…The generated oxidized species in the bulk are not expected because they would facilitate the moisture absorption and space charge accumulation, , leading to the malfunction of its adhesive property, insulating property, and dielectric property. γ radiation tended to cause simultaneous chain scission and cross-linking in the three-dimensional network of epoxy, significantly changing the segmental dynamics and mechanical property. , Interestingly, Zimmermann et al reported that the structural epoxy adhesive was not weakened by the combination of γ radiation (32.4 kGy) and tensile loading . Owing to the difference in chemical components, structures, and radiation conditions, the antagonistic scission and cross-linking reactions predominated over each other alternatively. ,,,− The silica filler in the epoxy composites was found to react with epoxy at a high electron irradiation dose .…”

“…γ radiation tended to cause simultaneous chain scission and cross-linking in the three-dimensional network of epoxy, significantly changing the segmental dynamics and mechanical property. , Interestingly, Zimmermann et al reported that the structural epoxy adhesive was not weakened by the combination of γ radiation (32.4 kGy) and tensile loading . Owing to the difference in chemical components, structures, and radiation conditions, the antagonistic scission and cross-linking reactions predominated over each other alternatively. ,,,− The silica filler in the epoxy composites was found to react with epoxy at a high electron irradiation dose . The space charge density and water diffusion coefficient of silica-filled epoxy were increased after γ radiation (4 and 8 kGy) and hydrothermal aging (90 °C) .…”

“…42,43 Interestingly, Zimmermann et al reported that the structural epoxy adhesive was not weakened by the combination of γ radiation (32.4 kGy) and tensile loading. 44 Owing to the difference in chemical components, structures, and radiation conditions, 1 the antagonistic scission and crosslinking reactions predominated over each other alternatively. 13,31,39,43−46 The silica filler in the epoxy composites was found to react with epoxy at a high electron irradiation dose.…”

Effect of γ‐ray irradiation on epoxy network polymers with different curing agents

“…11 These radicals cause further chain scission and crosslinking, resulting in changes in the molecular structure of the polymeric materials and, consequently, changes in their mechanical and physicochemical properties. [12][13][14][15][16][17][18] Such irradiation effects are known to vary greatly depending on the polymer, additives, and irradiation conditions (i.e., the dose rate, atmosphere, and temperature). 5,14,[18][19][20][21] Numerous researchers have reported on the effects of irradiation on networked polymers, including epoxy resins and their composites.…”

Simplified stiffness analysis for degraded single lap joints in the space sector – Comparative analytical and finite element analysis

“…Due to the chemical composition of structural adhesives, the resistance against ionizing radiation plays a major role in field of aging processes, especially for space applications. 12–14 For the present work, the following hypotheses is proposed: Existing expressions for the stress state in a SLJ, can be combined to generate a closed form solution for the stiffness of this joint which considers peel stress. Using a linear degradation parameter extracted from experimental data, the degradation of the adhesive can be taken into account for the linear elastic regime.…”