Abstract

Measurement of deformation history during a high-speed mechanical test plays an important role in establishing the dynamic behavior of materials. Traditional strain measuring techniques such as extensometers and strain gauges have limitations such as frequency response and range of strain. Kevlar 49 fabrics were tested in tension within a strain-rate range of 25 to 170 s-1 using a high-speed servohydraulic testing system. Results show that the dynamic material properties in terms of Young's modulus, tensile strength, maximum strain, and toughness increase with increasing strain rate. The woven nature of Kevlar 49 fabric results in large displacements and shape changes during tests. Noncontacting strain measuring technique is therefore highly preferred. A technique was developed using image analysis to obtain the deformation of Kevlar 49 fabrics at the tested strain rates. Using image analysis results, the stress-strain curves of Kevlar 49 fabrics at different strain rates were constructed and compared with those based on stroke measurement. Good agreement was obtained between these two methods.

Original languageEnglish (US)
Pages (from-to)230-239
Number of pages10
JournalJournal of Materials in Civil Engineering
Volume23
Issue number3
DOIs
StatePublished - Mar 2011

Fingerprint

Tensile testing
Strain rate
Image analysis
Dilatometers
Stress-strain curves
Strain gages
Toughness
Frequency response
Materials properties
Tensile strength
Elastic moduli
Kevlar 49
Testing

Keywords

  • Dynamic properties
  • Dynamic tensile testing
  • Image analysis
  • Kevlar 49 fabrics
  • Strain rates
  • Stress-strain relations

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Dynamic Tensile Testing of Kevlar 49 Fabrics. / Zhu, Deju; Mobasher, Barzin; Rajan, Subramaniam.

In: Journal of Materials in Civil Engineering, Vol. 23, No. 3, 03.2011, p. 230-239.

Research output: Contribution to journalArticle

@article{5373cda91ed64fce814d3cbd98a5d468,
title = "Dynamic Tensile Testing of Kevlar 49 Fabrics",
abstract = "Measurement of deformation history during a high-speed mechanical test plays an important role in establishing the dynamic behavior of materials. Traditional strain measuring techniques such as extensometers and strain gauges have limitations such as frequency response and range of strain. Kevlar 49 fabrics were tested in tension within a strain-rate range of 25 to 170 s-1 using a high-speed servohydraulic testing system. Results show that the dynamic material properties in terms of Young's modulus, tensile strength, maximum strain, and toughness increase with increasing strain rate. The woven nature of Kevlar 49 fabric results in large displacements and shape changes during tests. Noncontacting strain measuring technique is therefore highly preferred. A technique was developed using image analysis to obtain the deformation of Kevlar 49 fabrics at the tested strain rates. Using image analysis results, the stress-strain curves of Kevlar 49 fabrics at different strain rates were constructed and compared with those based on stroke measurement. Good agreement was obtained between these two methods.",
keywords = "Dynamic properties, Dynamic tensile testing, Image analysis, Kevlar 49 fabrics, Strain rates, Stress-strain relations",
author = "Deju Zhu and Barzin Mobasher and Subramaniam Rajan",
year = "2011",
month = "3",
doi = "10.1061/(ASCE)MT.1943-5533.0000156",
language = "English (US)",
volume = "23",
pages = "230--239",
journal = "Journal of Materials in Civil Engineering",
issn = "0899-1561",
publisher = "American Society of Civil Engineers (ASCE)",
number = "3",

}

TY - JOUR

T1 - Dynamic Tensile Testing of Kevlar 49 Fabrics

AU - Zhu, Deju

AU - Mobasher, Barzin

AU - Rajan, Subramaniam

PY - 2011/3

Y1 - 2011/3

N2 - Measurement of deformation history during a high-speed mechanical test plays an important role in establishing the dynamic behavior of materials. Traditional strain measuring techniques such as extensometers and strain gauges have limitations such as frequency response and range of strain. Kevlar 49 fabrics were tested in tension within a strain-rate range of 25 to 170 s-1 using a high-speed servohydraulic testing system. Results show that the dynamic material properties in terms of Young's modulus, tensile strength, maximum strain, and toughness increase with increasing strain rate. The woven nature of Kevlar 49 fabric results in large displacements and shape changes during tests. Noncontacting strain measuring technique is therefore highly preferred. A technique was developed using image analysis to obtain the deformation of Kevlar 49 fabrics at the tested strain rates. Using image analysis results, the stress-strain curves of Kevlar 49 fabrics at different strain rates were constructed and compared with those based on stroke measurement. Good agreement was obtained between these two methods.

AB - Measurement of deformation history during a high-speed mechanical test plays an important role in establishing the dynamic behavior of materials. Traditional strain measuring techniques such as extensometers and strain gauges have limitations such as frequency response and range of strain. Kevlar 49 fabrics were tested in tension within a strain-rate range of 25 to 170 s-1 using a high-speed servohydraulic testing system. Results show that the dynamic material properties in terms of Young's modulus, tensile strength, maximum strain, and toughness increase with increasing strain rate. The woven nature of Kevlar 49 fabric results in large displacements and shape changes during tests. Noncontacting strain measuring technique is therefore highly preferred. A technique was developed using image analysis to obtain the deformation of Kevlar 49 fabrics at the tested strain rates. Using image analysis results, the stress-strain curves of Kevlar 49 fabrics at different strain rates were constructed and compared with those based on stroke measurement. Good agreement was obtained between these two methods.

KW - Dynamic properties

KW - Dynamic tensile testing

KW - Image analysis

KW - Kevlar 49 fabrics

KW - Strain rates

KW - Stress-strain relations

UR - http://www.scopus.com/inward/record.url?scp=79952401774&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79952401774&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)MT.1943-5533.0000156

DO - 10.1061/(ASCE)MT.1943-5533.0000156

M3 - Article

VL - 23

SP - 230

EP - 239

JO - Journal of Materials in Civil Engineering

JF - Journal of Materials in Civil Engineering

SN - 0899-1561

IS - 3

ER -