Accession Number:

AD1089565

Title:

Nonlinear Constitutive Modeling of Viscoelastic Foams: Application to Impact Protection

Descriptive Note:

[Technical Report, Final Report]

Corporate Author:

Brown University

Personal Author(s):

• Henann, David

Report Date:

2019-08-30

Pagination or Media Count:

80

Abstract:

Open-cell elastomeric foams are materials made up of two continuous phases a polymeric elastomer matrix and a connected, air-filled pore space. Due to their elastomeric matrix and porous structure, these materials are highly compliant and capable of undergoing large, reversible deformations involving substantial changes in volume. Moreover, due to the viscoelasticity of the elastomeric matrix, many elastomeric foams display a highly dissipative, rate-dependent mechanical response, manifesting in rate-dependence of the stressstrain response and hysteresis under reversed loading. These materials are widely-used in situations, in which both compliance and energy dissipation are necessary, e.g., impact protection, cushioning, and vibration damping, and appear in a wide variety of specific applications, such as personal protective equipment.

Descriptors:

• mechanics
• measurement
• geometry
• accuracy
• constitutive equations
• experimental data
• load cells
• materials
• materials testing
• mechanical engineering
• protective equipment
• shear modulus
• algorithms
• boundaries
• cross correlation
• digital images
• engineering
• equations
• far field
• free energy

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

[A, Approved For Public Release]