Accession Number:

ADA063497

Title:

Simulation of the Dynamic Tensile Characteristics of Nylon Parachute Materials

Descriptive Note:

Final rept. 1 Nov 1973-1 Nov 1976

Corporate Author:

AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

• McCarty, Robert E.

Report Date:

1978-11-01

Pagination or Media Count:

183.0

Abstract:

The empirical development of nylon material subroutines for use in computer analysis of parachute system dynamics is discussed. The subroutines account for material plasticity, creep and hysteresis. They predict peak forces and strains accurately or - 5 and are valid over broad ranges of strain rate three decades and tensile load zero to minimum breaking strength. The strain rate sensitivity of nylon is shown to be a manifestation of material creep. Previous models are simplistic by comparison and have been, in general, unsatisfactory. A package of data processing computer programs also developed provides the capability to quickly generate additional subroutines for similar materials from limited test data.

Descriptors:

• *PARACHUTE FABRICS
• *TENSILE PROPERTIES
• *COMPUTERIZED SIMULATION
• *NYLON
• HYSTERESIS
• CREEP STRENGTH
• SUBROUTINES
• DYNAMIC LOADS
• MATHEMATICAL PREDICTION
• STRAIN RATE
• PLASTIC PROPERTIES

Subject Categories:

• Textiles
• Computer Programming and Software
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE