A Numerical Investigation of Risk Factors Affecting Lumbar Spine Injuries Using a Detailed Lumbar Model

Table 2

Material properties used in the current study.

Segments	MAT	R0 (t/mm^3)	E (MPa)/K (N/mm)	Poisson ratio	A (MPa)	B (MPa)	N	C	PSFAIL	SIGMAX (MPa)
Cortical bone	98	1.83E − 09	11,740	0.3	106.7	100	0.1	1	9.40E − 03	150
Cancellous bone	98	1.80E − 10	259	0.25	1.71	20	1	1	1.30E − 02	1.985
Endplate vertebra	98	1.06E − 09	9450	0.3	5.67	100	1	3	1.89E − 02	7.1
Endplate disc	1	1.20E − 09	200	0.3
Disc annulus	27	1.20E − 09	0.49		0.24	−0.06
Disc nucleus	27	1.00E − 09	0.495		0.64	−0.16
Fiber	71	1.20E − 09	Curves
Ligaments	74	1.00E − 09

In LS_DYNA material keywords, the strain energy density of MAT_MOONEY-RIVLIN_RUBBER is defined as a function of constant A, constant B, and Poisson ratio [16].