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Lab Module – Tension and Rupture of Skin

MA301

A lab module with related accessories for an undergraduate biomechanics class

SKU: MA301 Categories: ,

The tension test is a fundamental test configuration in the field of material characterization. This undergraduate biomechanics class laboratory module consists of assessing mechanical properties of both polyethylene sheet and rat skin. Throughout this laboratory, each team will: prepare polyethylene and rat skin dogbone-shaped samples; test samples in tension until rupture; produce stress-strain curves considering the sample geometry and calculates mechanical properties; discuss the tensile behavior of each material.
Includes syllabus (instructor’s editable version) and turn-key sample preparation kit (e.g. polyethylene sheet, razor blades, needles or pins, aluminum spacer) allowing about 10 repetitions (team of 2-5 students).
Requires a Mach-1 tester (MA001 or higher), a uniaxial load cell (MA296 or MA297), tensile grips kit (MA090), dogbone sample cutting die (MA333) and a testing chamber (MA626).

  • Designed to be used in contact with physiological saline solution
  • Deemed an excellent educational tool for students
Team Size

from 2 to 5 students

Duration1

30 min (preparation)

Duration2

2 hours (hand-on work)

Duration3

30 min (data analysis)

Documents and resources (1)

Test configurations (1)

FAQ

What is the elongation at rupture?
The amount of uniaxial strain at fracture including both elastic and plastic deformation.

Lab Module — Tension and rupture of skin

LAB MODULE – Tension and Rupture of Skin – Student Version

What is the ultimate tensile strength (tensile strength)?
Ultimate tensile strength is the maximum stress developed in a material before rupture in a tension test.

Lab Module — Tension and rupture of skin

LAB MODULE – Tension and Rupture of Skin – Student Version

What is the yield strength?
What is the plastic region?
Region of a stress-strain curve where the deformation undergone by a material remains after the load is removed. The plastic deformation is the permanent part of the deformation beyond the elastic limit of a material.

Lab Module — Tension and rupture of skin

LAB MODULE – Tension and Rupture of Skin – Student Version

What is the elastic region?
Linear region of a stress-strain curve where a material deformed under load or strain will return to its original shape when the stress is released. The slope of the elastic region is used in the calculation of the Young's modulus.

Lab Module — Tension and rupture of skin

LAB MODULE – Tension and Rupture of Skin – Student Version

What is the toe region?
Region of a stress-strain curve prior to the elastic region. The shape of the toe region is different from that of the elastic region due to the primary realignment of the sample in the grip, the straightening of slack fibers and the rotation of collagen fibers to align with the direction of elongation.

LAB MODULE – Tension and Rupture of Skin – Student Version

What is polyethylene?
It is the most common plastic and it is a polymer created via polymerization of many small molecules, known as monomers, of ethylene. Their consequently large molecular mass relative to small molecule compounds produce unique mechanical properties, including toughness and viscoelasticity. Polyethylene is a flexible plastic that has an elastic behavior at small deformations and a plastic behavior at higher deformations.

Lab Module — Tension and rupture of skin

LAB MODULE – Tension and Rupture of Skin – Student Version

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