1995-02-01

Effect of Regrind on SMA Copolymer Boss/Joint Performance 950810

To minimize warranty costs, due to squeak and rattle from ill fitting joints, automotive OEMs are requiring increased durability of thermoplastic attachments. There are several evaluation techniques for determining thermoplastic joint durability performance such as: strip-to-drive torque, screw pull-out force, and clamp load fall-off. A thermoplastic attachment (i.e. boss) which experiences clamp load fall-off will result in a loose fitting joint and subsequently lead to squeaks and rattles. In conjunction with the boss's performance the type of captured material between the screw and the joint can also contribute significantly to the overall retention qualities of the attachment.
The purpose of this paper is to evaluate: 1.) strip-to-drive ratios for thermoplastic bosses, and 2.) changes in clamp load with respect to environmental effects (i.e. thermal exposure) on thermoplastic bosses. Injection molded styrene-maleic anhydride (SMA) bosses were tested using three different levels of regrind content, five different boss ID's, and eleven different screw types.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 17% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
STANDARD

Hose Assemblies, Installed, Visual Inspection Guide For

ARP1658B

View Details

STANDARD

HOSE, AIR DUCT, FLEXIBLE, SILICONE-COATED FABRIC, EXTERNAL NYLON HELIX, LOW-NOISE

AS4804A

View Details

TECHNICAL PAPER

Coolant Hose Clamp Fitting Joint Design Guide

960269

View Details

X