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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 and Aerospace Engineering,
North Carolina State University,
Raleigh, NC 27695-7910
e-mail: lli24@ncsu.edu

Gracious Ngaile

Mem. ASME
Department of Mechanical and Aerospace Engineering,
North Carolina State University,
Raleigh, NC 27695-7910
e-mail: gngaile@ncsue.du

Tasnim Hassan

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

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received September 16, 2016; final manuscript received February 3, 2017; published online March 23, 2017. Editor: Jian Cao.

J. Micro Nano-Manuf 5(2), 024501 (Mar 23, 2017) (5 pages) Paper No: JMNM-16-1045; doi: 10.1115/1.4035954 History: Received September 16, 2016; Revised February 03, 2017

A novel hybrid heating method which combines the conventional electric-resistance specimen heating with microcoil heating of specimen ends to achieve uniform heating over the gauge length is presented. Resistive heating of a miniature specimen develops a 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 simulations were carried out to analyze the transient and steady temperature distribution in miniature specimens followed by experimental validation.

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Figures

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Fig. 9

Temperature distribution for a 10-mm-long specimen by hybrid heating

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Fig. 8

Temperature distribution for a 10-mm-long specimen by (a) resistance heating and (b) specimen end coil heating

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Fig. 7

The experiment setup for validation of the novel hybrid heating technique

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Fig. 6

The temperature distributions in a 50-mm-long specimen by three different heating methods

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Fig. 5

The temperature distributions in a 6-mm-long specimen by three different heating methods

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Fig. 4

The steady temperature distribution by coil heating for different specimen lengths

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Fig. 3

Transient and steady temperature distributions of a 6-mm specimen by coil heating

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Fig. 2

Electric-resistance heating temperature distributions for different specimen lengths

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Fig. 1

The resistive, coil, and hybrid heating methods, (a) and (b) the grippers and specimen, (c) current input for coil heating, resistive heating, and hybrid heating

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