Converting metal products to plastic
However, since bending rigidity is expressed as elastic modulus x I (second moment of inertia), for example, changing the cross-sectional shape or increasing the wall thickness of a plastic molded product allows rigidity equivalent to a metal product to be achieved.
Assuming a steel plate of 0.8 mm thickness (with a modulus of elasticity: 206,000 MPa) is produced using ABS resin (having a modulus of elasticity: 2,030 MPa), achieving equivalent rigidity requires crafting the product at a thickness of 3.7 mm. Actual moment of inertia can significantly fluctuate based on the cross-sectional shape. Thus, employing a rib structure allows the wall thickness to be reduced to between 2.5 and 3.0 mm.
However, because molded products often exhibit complex cross-sectional geometries, utilizing FEM (Finite Element Analysis) is recommended for a more precise stiffness prediction (assessing load/deflection). Depending on the application, considerations for creep, fatigue and chemical resistance are also imperative.
Important Note:
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