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This paper assesses the Neo-Hookean material parameters pertaining to deformation behaviour of hyperelastic material by means of numerical analysis. A mathematical model relating stress and stretch is derived based on Neo-Hookeans strain energy function to evaluate the contribution of the material constant, C1, in the constitutive equation by varying its value. A systematic parametric study was constructed and for that purpose, a Matlab programme was developed for execution. The results show that the parameter (C1) is significant in describing material properties behaviour. The results and findings of the current study further enhances the understanding of Neo-Hookean model and hyperelastic materials behaviour. The ultimate future aim of this study is to come up with an alternative constitutive equation that may describe skin behaviour accurately. This study is novel as no similar parametric study on Neo-Hookean model has been reported before.

Abstract. Based on the Market Watch 2012 with regards to the ASEAN region, Malaysia is the third biggest automotive manufacturing nation which employs more than 300,000 people. To accomplish their operation demands, manufacturing companies such as Proton and Perodua would utilize artificial lighting in their respective manufacturing plants. Research on the effects of artificial lighting on human expended about millions of dollars every years. Sufficient lighting is required for effective tasks completion while providing adequate visual capability, thus will ensure the safety of the operators. Eye strain, migraine and headache are among the common symptoms caused by poor lighting at workplace. This study aims to review on prior research regarding sufficient lighting while giving a special focus on light assessment techniques and tools in determining the luminous level in manufacturing plants. This study will contribute to create awareness among the manufacturing plant on the importance of lighting in term of work performance and occupational safety and health.