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Headform and N95 filtering facepiece respirator interaction: contact pressure simulation and validation.

Authors
Lei-Z; Yang-JJ; Zhuang-Z
Source
J Occup Environ Hyg 2012 Jan; 9(1):46-58
NIOSHTIC No.
20040077
Abstract
This article presents a computational and experimental study of contact pressure between six N95 filtering facepiece respirators (FFRs) and five newly developed digital headforms (small, medium, large, long/narrow, and short/wide). Contact interaction is simulated using the finite element method and validated by experiments using a pressure mapping system. The headform model has multiple layers: a skin layer, muscle layer, fatty tissue layer, and bone layer. Each headform is divided into five parts (two parts for the cheeks, one part for the upper forehead, one part for the chin, and one part for the back side of the head). Each respirator model comprises multiple layers and two straps. The simulation process has two stages for each respirator/headform combination. The first stage is to wrap the straps around the back of the headform and pull the respirator away from the face. The second stage is to release the respirator so that the respirator moves toward the face. Strap forces and contact interactions are generated between the respirators and the headforms. Meanwhile, a real-time surface pressure mapping system is used to record the pressures at six key locations to validate the computational results. There is a strong correlation between computational and experimental results (R2 = 0.88). By comparing the pressure values from simulations and experiments, we have validated the simulation models.
Keywords
Respirators; Respiratory-protective-equipment; Analytical-models; Analytical-processes; Simulation-methods; Author Keywords: digital headform; FE method; fit and comfort; respirator; stress and strain
Contact
James Yang, Human-Centric Design Research Lab, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409
CODEN
JOEHA2
Publication Date
20120101
Document Type
Journal Article
Email Address
james.yang@ttu.edu
Funding Type
Contract
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Contract-254-2009-M-31878; B01182012
Issue of Publication
1
ISSN
1545-9624
NIOSH Division
NPPTL
Priority Area
Healthcare and Social Assistance
Source Name
Journal of Occupational and Environmental Hygiene
State
TX; PA
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