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What is yield point?
The yield point is the point on a stress-strain curve where a material begins to deform plastically. Before this point, deformation is elastic and reversible. Beyond it, the material undergoes permanent change.
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Comparison with other peel tests
A 90° peel test is often used for flexible packaging films.
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Introduction to penetration and puncture resistance testing
Penetration and puncture resistance testing are essential for evaluating how well a material can withstand force from sharp, pointed, or blunt objects.
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Why is top-load testing important?
Top-load testing plays a critical role in packaging design, quality assurance and compliance. It helps to:
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Test method and procedure
In a climbing drum peel test, one end of a bonded specimen is clamped to a rotating drum while the other end is fixed to the crosshead of the test machine.
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Pharmaceuticals
The pharmaceutical industry is tightly controlled and subject to strict regulations, which means that testing is often at the heart of demonstrating compliance to the various international standards which govern the industry.
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Types of compressive shear tests
Test configurations vary according to the material, application, and relevant industry standard.
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What is extrusion testing?
Extrusion testing involves forcing a food sample through a shaped orifice, grid, or opening while measuring the resistance to movement.
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Applications across industries
T-peel testing is widely used in industries where adhesive bonds are critical:
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What is shear modulus?
Shear modulus defines a material’s resistance to shape change under shear forces - where parallel planes slide past one another.
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Understanding flexural strength
Flexural strength (modulus of rupture) refers to a material’s resistance to deformation under load.
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Secant modulus compared to other moduli
Different moduli are used to describe the stiffness of materials, each calculated at different points on the stress-strain curve:
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Applications in industry
Engineering and manufacturing uses
Tangent modulus testing supports design validation and process control in sectors where materials operate near or beyond the elastic range, for example:
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Introduction to yield point testing
Yield point testing is essential for understanding the mechanical behaviour of materials.
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What is the trapezoidal tear test?
The trapezoidal tear test is a mechanical method used to determine the tear strength of flexible sheet materials.
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Applications in industry
Construction materials
Cleavage strength testing is used to verify the integrity of structural materials such as laminated timber beams, bonded façade panels, and composite structures.
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What is top-load testing?
Top-load testing, also known as column crush testing, is a method used to evaluate the ability of a packaging component to withstand a vertical compressive force without deforming or failing.
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Introduction to compressive shear testing
Compressive shear testing is a mechanical test method used to measure a material’s ability to resist shear forces while under compressive load.
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What is elongation at break?
Elongation at break measures how much a material can stretch before it fractures. Expressed as a percentage of the original gauge length, it is a key indicator of ductility and toughness.
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Introduction to insertion and withdrawal testing
Insertion and withdrawal testing is a critical method for evaluating the performance, durability, and reliability of components that require secure and repeatable connections.
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Puncture resistance testing methods
Puncture resistance measures the ability of a material to withstand an actual perforation event, simulating damage from sharp or pointed objects.
Applications include:
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Introduction to T-peel testing
T-peel testing is a specialised method for determining the adhesive bond strength between two flexible materials joined together.
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Standards and regulations in shear testing
Several industry standards and protocols govern food shear testing, ensuring repeatable results and regulatory compliance. Examples include:
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Coefficient of friction (COF) explained
Understanding the COF formula
The coefficient of friction (μ) is a dimensionless value calculated as:
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Why Mecmesin for puncture and shear testing
Mecmesin offers testing systems for puncture and shear applications across films, fabrics, and boards. Our solutions are engineered for accuracy, repeatability, and compliance with international standards.