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Technical Brief

A Novel Hybrid Heating Method for Mechanical Testing of Miniature Specimens at Elevated Temperature

[+] Author and Article Information
Lin Li

Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910
lli24@ncsu.edu

Gracious Ngaile

Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910
gngaile@ncsue.du

Tasnim Hassan

Department of Civil, Construction, & Environmental Engineering, North Carolina State University, Raleigh, NC 27695-7908
thassan@ncsu.edu

1Corresponding author.

ASME doi:10.1115/1.4035954 History: Received September 16, 2016; Revised February 03, 2017

Abstract

A novel hybrid heating method which combines the conventional electric-resistance specimen heating with micro-coil heating of specimen ends to achieve uniform heating over the gauge length is presented. Resistive heating of a miniature specimen develops parabolic temperature profile with lowest temperature at the grip ends because of the heat loss to the gripper. Coil heating at the specimen ends compensates for this heat loss resulting in uniform temperature distribution over the central segment of the specimen. Thermo-electric finite element (FE) simulations were carried out to analyze the transient and steady temperature distribution in miniature specimens followed by experimental validation.

Copyright (c) 2017 by ASME
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