Experimental study of strain rate effects on the strength of adhesively bonded joints after hygrothermal exposure

Zhang, Fan; Yang, Xin; Xia, Yong; Zhou, Qing; Wang, Huiping; Yu, Tongxi

doi:10.1016/j.ijadhadh.2014.07.008

Cited by 40 publications

(7 citation statements)

References 21 publications

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“…Okba et al [47] rightly noticed that it is necessary to conduct research related to the exposure time and thermal conditions of use of adhesives and adhesive joints of various construction materials, including composites and modified adhesives, as it affects the safety of use of bonded structures. Zhang et al [48] underlined that the strength of adhesive joints could change after a long-term environmental exposure and they evaluated the rate effect on the strength of adhesively bonded joints (prepared by epoxy adhesive) after hygrothermal exposure (80 • C and 95% RH). Therefore, it seems advisable to undertake research in this direction.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Mechanical Properties of Epoxy Compounds Modified with Calcium Carbonate and Carbon after Hygrothermal Exposure

Rudawska

2020

Materials

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The objective of this paper is to analyze the effects of hygrothermal exposure on the mechanical properties of epoxy compounds modified with calcium carbonate or carbon fillers. In addition, comparative tests were carried out with the same parameters as hygrothermal exposure, but the epoxy compounds were additionally exposed to thermal shocks. The analysis used cylindrical specimens produced from two different epoxy compounds. The specimens were fabricated from compounds of epoxy resins, based on Bisphenol A (one mixture modified, one unmodified) and a polyamide curing agent. Some of the epoxy compounds were modified with calcium carbonate (CaCO3). The remainder were modified with activated carbon (C). Each modifying agent, or filler, was added at a rate of 1 g, 2 g, or 3 g per 100 g of epoxy resin. The effect of the hygrothermal exposure (82 °C temperature and 95% RH humidity) was examined. The effects of thermal shocks, achieved by cycling between 82 °C and −40 °C, on selected mechanical properties of the filler-modified epoxy compounds were investigated. Strength tests were carried out on the cured epoxy compound specimens to determine the shear strength, compression modulus, and compressive strain. The analysis of the results led to the conclusion that the type of tested epoxy compounds and the quantity and type of filler determine the effects of climate chamber aging and thermal shock chamber processing on the compressive strength for the tested epoxy compounds. The different filler quantities, 1–3 g of calcium carbonate (CaCO3) or activated carbon (C), determined the strength parameters, with results varying from the reference compounds and the compounds exposure in the climate chamber and thermal shock chamber. The epoxy compounds which contained unmodified epoxy resin achieved a higher strength performance than the epoxy compounds made with modified epoxy resin. In most instances, the epoxy compounds modified with CaCO3 had a higher compressive strength than the epoxy compounds modified with C (activated carbon).

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Mechanical Properties of Epoxy Compounds Modified with Calcium Carbonate and Carbon after Hygrothermal Exposure

Rudawska

2020

Materials

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“…They showed an increase in the ultimate tensile strength, by enhancing the loading rate. Zhang et al 19 performed an experimental study of strain rate effects on the strength of adhesively bonded joints after hygro‐thermal exposure. They found that an increase in the loading rate led to an increase in the ultimate tensile strength and the yield stress.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of mechanical properties and ductile/brittle behaviors in aluminum‐silicon alloy to loading rate and nano‐particles, considering interaction effects

Azadi

Zomorodipour

Fereidoon

2020

Engineering Reports

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Aluminum‐silicon alloys have been widely used in automotive industries. To know mechanical properties of such materials is essential for engineers to have a superior design for components. Therefore, in this article, the sensitivity analysis of mechanical and fracture features in the aluminum alloy has been performed to find the effect of the loading rate and nano‐particles. For this objective, tensile tests were performed on casting standard specimens. Then, obtained experimental data were analyzed by the Minitab software, using the factorial method. In addition, the interaction between the effect of the loading rate and the addition of nano‐particles, on mechanical properties and ductile/brittle behaviors, was also investigated. Obtained results indicated that the yield stress, the elastic modulus and the elongation were sensitive to the interaction of both factors (the multiply of the nano‐particle addition and the loading rate). Besides, the fracture surface illustrated that by increasing the loading rate and the addition of nano‐particles, the brittleness of the material increased.

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“…Liu et al [4] and Mohsen et al [5] investigated the durability of carbon fiber-reinforced plastic joints in hygrothermal environments, and reported that the strength and failure modes were both affected by moisture and temperature. Numerous studies have reported that the interaction of temperature and moisture can accelerate joint ageing rates [6][7][8], and that strength reduction is primarily related to moisture absorption, which decreases adhesive performance and increase substrate corrosion [9][10][11][12]. Qin et al [13] investigated temperatures in the cohesive zone mode via experimental study and reported that the effects of high temperatures are more evident than those of low temperatures on the mechanical properties of bonded joints.…”

Section: Introductionmentioning

confidence: 99%

Surface Treatment for Improving Durability of Aluminum-Lithium Adhesive-Bonded Joints under Hot-Humid Exposure

Huang

et al. 2019

Coatings

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The performance of adhesive-bonded joints, which are being increasingly used in the aerospace and automotive industries, under hot-humid conditions remains largely unknown. The effect of surface treatments on the strength durability of aluminum-lithium (Al-Li) alloy adhesive-bonded joints under hot-humid exposure was investigated. Varied surface characteristics were achieved by different mechanical and chemical treatments; combined mechanical and phosphoric acid anodization (PAA) treatments were also used. The adhesive-bonded joints were then exposed to a hot-humid environment. The surface morphology, strength degradation, failure modes, and corrosion resistance of the substrates were analyzed. The results indicated that the combined PAA/mechanical method improved the joint durability under hot-humid exposure. The treated surface, with a roughness of 2.85 μm, exhibited the best durability, losing only 6% of strength after exposure; the failure mode remained cohesive-failure dominant. The durability enhancement was attributed to the porous and moderate rough surface characteristics, which protected the substrate from corrosion and decreased the rate of moisture diffusion from the bonding interface, thereby reducing the degradation of the bonding interface and improving the durability of the joint.

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Experimental study of strain rate effects on the strength of adhesively bonded joints after hygrothermal exposure

Cited by 40 publications

References 21 publications

Experimental Study of Mechanical Properties of Epoxy Compounds Modified with Calcium Carbonate and Carbon after Hygrothermal Exposure

Experimental Study of Mechanical Properties of Epoxy Compounds Modified with Calcium Carbonate and Carbon after Hygrothermal Exposure

Sensitivity analysis of mechanical properties and ductile/brittle behaviors in aluminum‐silicon alloy to loading rate and nano‐particles, considering interaction effects

Surface Treatment for Improving Durability of Aluminum-Lithium Adhesive-Bonded Joints under Hot-Humid Exposure

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