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J. Japan Inst. Metals, Vol. 65, No. 7 (2001), pp. 548_
556
Special Issue on Ecomaterials Selection
Ý 2001 The Japan Institute of Metals
Materials Selection for Environmentally Conscious Products
Narito Shibaike
Human Environment Development Center, Matsushita Electric Industrial Co., Ltd., Kawasaki 214_
8501
A rationalized methodology focusing on environmentally conscious materials selection for product design is described. This
is a well_
tailored application of the famous methodology for materials selection in mechanical design built by M. F. Ashby. A new
value, environmental performance, is defined as the `product performance per its environmental impact' in order to make a
productive method, and is introduced into practical design process as well as a conventional value, cost performance. A case study
on materials selection for TV's front cabinet is presented to show the method's effectiveness. According to the study magnesium
alloys can be used for the component instead of the conventional material, polystyrene_
fireproof in compound aspects of perfor­
mance, cost and impact. An environmental impacts database of engineering materials to support the methodology is quite im­
portant and being created. A further approach on the development of a tool using a trial database for the efficient evaluation of
materials is also presented. This software has a couple of benefits for average designers such as automatically creating of the per­
formance indices and value functions, and its menu system to designate the design and value conditions is really easy and swift to
use even if not having professional knowledge. The case study on head arms of hard disk drives makes it clear that the tool is valu­
able to create green products, particularly in the early stage of design process.
(Received January 24, 2001; Accepted February 15, 2001)
Keywords: materials selection methodology, environmentally conscious products, environmental performance, value function, environ­
mental impacts database, materials evaluation tool
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Fig. 5 Result of compound evaluation by cost and environmental performance indices in stiffness of materials for TV's front
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Table 1 Evaluation results of materials for TV's front cabinet
(From the reference18)).
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Al and Mg
Aluminium alloys Magnesium alloys
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Area A
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« Precision component such as head arms for HDD
« Design conditions
–Section shape:
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figures
Bending moment, Twisting moment
–Mode of loading:
–Constraints:
Stiffness (High stiffness)
Vibration (High resonant frequency)
Thermal distortion (Minimum thermal
distortion)
« Value conditions
Wrought ferritic stainless steel
–Reference material:
–Allowance value:
Mass 90÷, Cost 110÷, Impact 100÷
–Environmental impact:
Primary energy content, SOx emission,
Resource depletion index
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