Effect of Full Temperature Field Environment on Bonding Strength of Aluminum Alloy
Round 1
Reviewer 1 Report
please consider improving manuscript syntax and language. please consider to better point out the relevant information.
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Reviewer 2 Report
The authors investigated the effect of temperature on the strength of the joint of joints made of aluminum alloys at different temperatures of deformation.
The results of investigation demonstrate that the Young's modulus, tensile strength and failure strain of the adhesive decrease with the increase of temperature. The adhesive strength of the single lap joint is more sensitive to the change of temperature. With the increase of the adhesive angle, the stiffness of the joint increases gradually, while with the increase of temperature, the stiffness of all the tested joints decreases gradually.
Based on the experimental data, the function of failure criteria is proposed, which provides a reference for the failure prediction of adhesive structures under different temperatures and complex stress conditions.
- It is known that the rate of the deformation has a significant effect on the strength characteristics of materials. The authors carried out a study for a single value of the rate (5 mm / min). How, according to the authors, the variation of this parameter will affect the results obtained.
- Line 207 indicates the range of humidity variation: from 20% RH to 99% RH. Are there plans to carry out experiments for different humidity values in the future?
- Authors should check Table 3 (group of the results corresponding to temperature T = 0).
- The authors found a rather interesting effect. At positive temperatures (T>0С), the dependence of the average strength on the adhesive angle is characterized by a minimum, and at negative temperatures, the strength increases with an increase in the adhesive angle. This fact requires an explanation.
- Why the range of the average failure load variation at temperatures of 25C and 80C differs from the parameters used at temperatures of -40C, -20C, 0C, 40C, 60C.
- There is an error in the title of Table 4.
- Authors should state in more detail and clearly the provisions set out on lines 287, 288: "With the increase of temperature, the change range of ductility decreases, and that of failure strength is larger."
- Authors found that the the load-displacement curve basically presented three consecutive stages in both high and low temperature environments: I. Near linear increase; II. nonlinear variation; III. the failure phase. However, within stage 3, two modes can be distinguished. In one of these modes, there is a sharp decrease of the load with an increase of displacement, in the other - a smooth one, passing to a plateau. This result should be commented.
- How to explain the abnormally high joint stiffness values at adhesive angle equal 150.
- Equation (5) on line 407 is best placed after the phrase: "When the ambient temperature is brought into Equation (4), the failure criterion of adhesive joints at this temperature can be obtained, which provides the basis for the failure prediction of adhesive structure."(lines 488 - 491).
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Reviewer 3 Report
An excellent overview of the effects of temperature on the bonding of aluminium alloys.
A minor spell check is required.
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