Behavior of bolted joints in composite laminates

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:7149688

Jurf, R A

This investigation characterizes bolted joint strength in Kevlar/epoxy and graphite/epoxy (0/45/90/-45)/sub 25/ composite laminates. The fundamental problem of a single bolt hole loaded symmetrically in tension is addressed. The first objective is to generalize the relationships between width, edge distance, hole size, thickness, washer diameter, and degree of lateral constraint with bolted joint strength based on experimental observations. The second objective is to numerically predict the same observation using only lamina properties. The effective laminate behavior is calculated with a nonlinear laminate analysis based on the material and the stacking sequence. The effective laminate properties are input into a nonlinear finite-element analysis to model the bolted joint. The degree of lateral surface constraint is also included in the analysis. The predicted bolted-joint failure regions and strengths were consistent with the experimental data, although improved nonlinear constitutive finite-element models are needed. The analysis is useful in predicting critical width, edge distance,and washer sizes needed to optimize bolted joint strength.

• Research Organization: Delaware Univ., Newark (USA)
• OSTI ID: 7149688
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ARAMIDS
BOLTED JOINTS
CARBON
COMPOSITE MATERIALS
ELEMENTAL MINERALS
ELEMENTS
EPOXIDES
FAILURE MODE ANALYSIS
FINITE ELEMENT METHOD
GRAPHITE
JOINTS
MATERIALS
MECHANICAL PROPERTIES
MINERALS
NONLINEAR PROBLEMS
NONMETALS
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
SYNTHETIC MATERIALS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
YIELD STRENGTH