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1226
[Page extract]
Coefficient of friction (COF) explained
Understanding the COF formula
The coefficient of friction (μ) is a dimensionless value calculated as:
1227
[Page extract]
Peel test procedure - step by step
Prepare the specimen: Cut and condition according to the relevant standard.
Set up the machine: Install the correct fixture for the test type.
1228
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ASTM F3014-14
1.1 This test method describes the procedure for penetration testing sharp and blunt needles used for the placement of surgical sutures. It only describes the test procedures (Phase 1) and does not define a test medium at this time.
1229
Case study
Smoke grenade canister integrity
Customised engineering example
A manufacturer of smoke grenades required a means of testing the cap pull-off strength. The particular challenge was to grip the smooth metal cylinder for up to 5 kN of pulling force.
1230
[Page extract]
Key material testing standards
To ensure accuracy and comparability, elongation at break and tensile strength measurements are performed according to recognised industry standards.
1231
Event
Texture Testing for Bakery Applications
The primary goal for using instrumentation to measure texture is to capture an objective value to something that is typically evaluated very subjectively. Texture cannot be controlled unless it measured in a consistent and repeatable manner.
1232
[Page extract]
Introduction to climbing drum peel testing
Climbing drum peel testing is a specialised method used to measure the adhesive strength between bonded materials, particularly in flexible-to-rigid substrate combinations such as aluminium skins bonded to honeycomb cores.
1233
Case study
Clothing button pull-off TTF test
Requirement
The customer was a supplier to major UK clothing retailer Marks & Spencer, who stipulate that all fasteners and attachments must be tested to failure.
1234
Page
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1235
[Page extract]
How bridge torque is measured
Bridge torque is measured by applying rotational force to a closure until the tamper-evident bridges shear.
1236
[Page extract]
Industry standards and customisation
Alignment with recognised standards
Mecmesin systems support compliance with globally recognised testing standards, including:
1237
Case study
Railcar spring testing
Requirement
Seoul Metropolitan Railway Transit Corporation required a system for testing a variety of springs in their electric railcars. The springs range in size from 3mm to 100 mm in diameter.
1238
Case study
Rotary damper gear precision torque characteristics
Requirement
A global manufacturer and distributor of component parts that are used in products across many industries including transport, beauty, consumer goods and healthcare, came to Mecmesin with a challenging torque measurement applicatio
1239
[Page extract]
Key testing methods
Different materials require different approaches to compressive hardness testing. The most common methods are:
1240
[Page extract]
Measuring compressive modulus
Common testing methods
Internationally recognised standards specify how compressive modulus is measured for different material types and applications:
1241
Case study
Adhesive test on capsulated stoppers
Requirement
A capsulated stopper (T-top, Bar-Top or Altop®) is a natural or synthetic cork stopper where the end is glued into a cap of wood, PVC, porcelain, metal, glass or other material.
1242
Case study
Cosmetics tin label peel
Customised engineering example
Testing the adhesive peel strength of packaging labels applied at the post-production stage is more representative of their performance than at the label production stage.
1243
Case study
Cardboard beverage bottle carrier unfolding
Customised engineering example
A manufacturer of fully-enclosed cartons wanted to quality test the fold-out force for a variety of their designs, used mainly to package drinks bottles and cans.
1244
[Page extract]
Measurement and testing methods
Techniques for measuring tangent modulus
Tangent modulus is measured during tensile or compression testing, w
1245
[Page extract]
ISO 34-2 standards explained
ISO 34-2 specifies the Delft tear test procedure for vulcanised or thermoplastic rubber, ensuring testing is carried out under consisten
1246
[Page extract]
ASTM D1578
Significance and Use
Test Method D1578 for testing any spun yarn for breaking strength is considered satisfactory for acceptance testing of commercial shipments since the method has been used extensively in the trade.
1247
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ASTM D2062
The method(s) in the standard along with those in Test Methods D 2051, D 2052, D 2053, D 2054, D 2057, D 2058, D 2059, D 2060, and D 2061 are a collection of proven test methods.
1248
Event
Tensile Testing for Wiring Harness Connections
The only way of really knowing the strength of a crimped terminal is to pull it. This can reveal production problems, where strand nicks, incorrect crimp height, or effects from changes in terminal supply, may not be clearly apparent.
1249
[Page extract]
The standard specifies the procedures for measuring the force required for needle penetration and the drag force as the needle travels through a simulated skin or tissue.
1250
Page
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