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How muscle stiffness affects human body model behavior

: Trube, Niclas; Riedel, Werner; Boljen, Matthias

Volltext ()

BioMedical Engineering OnLine 20 (2021), Art. 53, 39 S.
ISSN: 1475-925X
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer EMI ()
muscle stiffness; finite element method; FEM; THUMS version 5; human body model; HBM; frontal impact; muscle model; active human body model; AHBM; occupant safety; solid muscle elements; car crash; numerical simulation

Active human body models (AHBM) consider musculoskeletal movement and joint stiffness via active muscle truss elements in the finite element (FE) codes in dynamic application. In the latest models, such as THUMS™ Version 5, nearly all human muscle groups are modeled in form of one-dimensional truss elements connecting each joint. While a lot of work has been done to improve the active and passive behavior of this 1D muscle system in the past, the volumetric muscle system of THUMS was modeled in a much more simplified way based on Post Mortem Human Subject (PMHS) test data. The stiffness changing effect of isometric contraction was hardly considered for the volumetric muscle system of whole human body models so far. While previous works considered this aspect for single muscles, the effect of a change in stiffness due to isometric contraction of volumetric muscles on the AHBM behavior and computation time is yet unknown.