Optimization of spring-back in creep age forming process of 7075 Al-Alclad alloy using D-optimal design of experiment method. (June 2016)

• Record Type: Journal Article
• Authors: Khamneh, Mohammad Ershadi; Askari-Paykani, Mohsen; Shahverdi, Hamidreza; Hadavi, Seyed Mohammad Mehdi; Emami, Mohammad
• Is Part Of: Measurement. Volume 88(2016:Jun.)
• Page Start: 278
• Page End: 286
• Publication Date: 2016-06
• Subjects: Creep age forming -- Spring-back -- D-optimal design of experiments -- 7075 Al-Alclad alloy; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2016.03.003
• Languages: English
• ISSNs: 0263-2241

Abstract

Graphical abstract: Highlights: A novel creep age forming apparatus is designed and used. D-optimal design of experiment is used to model and optimize creep age forming process. Mathematical model for spring-back is presented. An appropriate region for optimized spring-back and mechanical properties for 7075 Al-Alclad alloy is presented. Abstract: This paper attempts to model and predict the spring-back for creep age forming of a 7075 Al-Alclad alloy using statistical analyses based on a design of experiments method. Time and temperature were chosen as effective variables for determining spring-back in the creep age-forming process. The D-optimal design of experiments method facilitated statistical analyses and the extraction of a mathematical model for determining spring-back in the experimental variables domain. The spring-back of the specimens was calculated using a numerical procedure based on the pure bending theory. Analysis of the variances for spring-back showed that temperature was the most effective variable in the creep-age forming process. Additionally, a mathematical model and the response surface of the spring-back showed that to decrease spring-back, the significant variables should be in the upper level. The spring-back in the creep age-forming process was optimized for a 7075 Al-Alclad alloy in the optimum mechanical properties region.