Design of experiments applied to calibrate numerical model for single-lap-joint shear strength analysis

Abstract

En studie ble utført for å undersøke forholdet mellom limtykkelse og kondisjoneringstemperatur for to typer strukturelle epoksy-lim med hensyn på skjærstyrke. «Design of experiments» (DOE), sammen med strekktesting og numerisk analyse ble benyttet for å teste og forutsi bruddgrenser i adhesivt sammenføyde strukturer.

Flere typer lim ble screenet for å finne de beste kandidatene ut fra styrke-temperatur-forhold i tillegg til en rekke prosesskriterier. To limtyper ble valgt ut for «single-lap-joint»-strekktesting med stålsubstrat, hvor standard ASTM D 1002 ble fulgt for gjennomføringen. Resultatene ble benyttet til å bygge en numerisk modell for å kunne studere oppførsel av testobjektet, samt estimere bruddlast.

A study was conducted to investigate the relationship between adhesive thickness and conditioning temperature for two types of structural epoxy adhesives in terms of apparent shear strength. "Design of experiments" (DOE), together with tension load testing and numerical analysis were used to test and predict fracture limits in adhesively joined structures.

Several types of adhesives were screened to find the best candidates based strength-temperature relationships in addition to a number of processing criteria. Two types of adhesives were selected to undergo "single-lap-joint" experiments with steel substrates, where standard ASTM D 1002 was followed. The results were used to build a numerical model to be able to study the behavior of the specimen, as well as estimating the fracture load.