Spider silk tensile strength and toughness

The Mecmesin machine is a great piece of kit – it has allowed us to move forward with our research in a very productive way, and we are grateful for the excellent technical support that has come with it.

Dr. Sara Goodacre, Assistant Professor
Faculty of Medicine & Health Sciences

Requirement

The University of Nottingham is a global education facility – with campuses in the UK, China and Malaysia.

The School of Life Sciences, within the Faculty of Medicine and Health Sciences, has a depth of expertise in molecular and cell biology, biochemistry, genetics, microbiology, pharmacology, physiology, anatomy and zoology, which puts the University of Nottingham at the forefront of biological and medical science research.

One project is engaged in molecular genetic studies of spider silk, knowledge which has relevance in many spheres from pure education to future engineering applications.

The ‘SpiderLab’ team works with colleagues across the University, including the Nanotechnology and Nanoscience Centre and had the requirement to test the physical properties of particular types of this natural protein.

Although the raw materials are produced by some of the largest members of the infraorder – eg Mexican red knee tarantula (Brachypelma smithi) – the fibre test specimens are typically only a few tens of microns in width.

Therefore the solution required a delicate yet secure gripping in addition to the highest levels of accuracy for valid research data.
 

Solution

Mecmesin supplied a computer-controlled test stand, with fixtures and an appropriately rated loadcell, chosen to optimise resolution at the maximum expected tensile forces.

Emperor™ software controls the test procedure and the programming environment allows specific calculations to be performed to comprehensively characterise the performance of the silk sample.

Measurement of rate of extension, average load over certain extension ranges and work performed as well as elongation and load at break are recorded.

This extensive analysis provides insight into the variability amongst silks (and between strands of the same silk type).

The library files ensure the same extension test is able to be repeated a number of times for the same fibre, or ‘bundles’ of fibres which most closely replicates the material’s natural ecological use.

Securing of the test sample is achieved by means of bonding the fibre or fibres to a card ‘frame’, which is cut in two prior to the test. Lightweight grips – spring-loaded clamping for the upper and rubber-faced jaws in the lower - complete the precise specification.
 

System

  • MultiTest 2.5-i computer-controlled test stand
  • 2 N intelligent loadcell
  • Lightweight mini vice grip
  • Lightweight double action vice grip with rubber-faced jaws

MultiTest-iSingle-column force tester

PC-driven
MultiTest-i

The MultiTest-i is a versatile tensile and compression tester controlled by software running on a PC.

The single-column range fits neatly on your bench-top and is ideal for product testing applications according to your own test methods.

A wide range of tensile grips, bend jigs and compression fixtures make the single-column MultiTest-i easy to use for measuring tension and compression, from as little as 2 N right up to 5 kN.

MultiTest-i 2.5 kN automated force testing system
Console-driven
MultiTest-xt

The MultiTest-xt is a versatile tensile and compression tester controlled by software running on a touchscreen console.

The single-column range fits neatly on your bench-top and is ideal for product testing applications according to your own test methods.

A wide range of tensile grips, bend jigs and compression fixtures make the single-column MultiTest-xt easy to use for measuring tension and compression from as little as 2 N right up to 5 kN.

MultiTest-xt 2.5 kN automated force testing system, with operator console

The MultiTest-i is a versatile tensile and compression tester controlled by software running on a PC.

The single-column range fits neatly on your bench-top and is ideal for product testing applications according to your own test methods.

A wide range of tensile grips, bend jigs and compression fixtures make the MultiTest-i easy to use for measuring tension and compression, from as little as 2 N right up to 5 kN.

 

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