해석 시 단위 맞추기 - Consistent units

기본중의 기본. 단위 맞추기~//

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2.3.1 Units

Before starting to define this or any model, you need to decide which system of units you will use. Abaqus has no built-in system of units. Do not include unit names or labels when entering data in Abaqus. All input data must be specified in consistent units. Some common systems of consistent units are shown in Table 2–1.

Table 2–1 Consistent units.

Quantity	SI	SI (mm)	US Unit (ft)	US Unit (inch)
Length	m	mm	ft	in
Force	N	N	lbf	lbf
Mass	kg	tonne (103 kg)	slug	lbf s2/in
Time	s	s	s	s
Stress	Pa (N/m2)	MPa (N/mm2)	lbf/ft2	psi (lbf/in2)
Energy	J	mJ (10–3 J)	ft lbf	in lbf
Density	kg/m3	tonne/mm3	slug/ft3	lbf s2/in4

The SI system of units is used throughout this guide. Users working in the systems labeled “US Unit” should be careful with the units of density; often the densities given in handbooks of material properties are multiplied by the acceleration due to gravity.

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