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ADHESIVE & GLUE | INTRODUCTION | ADHESIVES | ADHESIVE BONDING | CONTACT
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:. ADHESIVES INTRODUCTION

Introduction
Adhesive advantages
Adhesive disadvantages
Adhesive applications
Definition of adhesive
Definition of polymer
Definition of adhesion
Adhesion theories
Contact angle
Surface energy
Thermoplastic
Elastomer
Thermoset
Glass transition temperature
Covalent chemical bond
Intermolecular forces
Mechanical properties adhesives
Polyaddition
Polycondensation
Polymerization
 
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Mechanical properties of adhesives.

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Adhesives, as any other material, have a number of characteristics or mechanical properties, which must be known in order to select, design and calculate the adhesive bonding.

Depending on the type of adhesive selected, we will get different mechanical properties to the other adhesives, so we can talk about elastic adhesives when we have a high elongation and rigid adhesive, and when they have a high strength.

The mechanical properties of an adhesive are defined by:

  • Strength to fracture

  • Fracture Elongation

  • Modulus of elasticity

  • Yield

Strength to fracture

We define the strength to fracture of an adhesive as the maximum force per unit area to be implemented in order to destroy the joint.

fracture strength

The strength to fracture is expressed in MPa or N/mm2.

The fracture of the strength is also known as stress to fracture.

Fracture Elongation

We define the elongation to fracture of an adhesive such as displacement or length variation has been the adhesive when it has reached the strength to fracture.

fracture elongation

Modulus of elasticity

The modulus of elasticity is defined as a constant that has the adhesive material that involves both as tension as the elongation, so that if its value is high, the adhesive has high strength but low elongation (rigid behavior) and if its value is small, the adhesive has a high elongation but low fracture strength (elastic behavior).

Depending on the type of stress or load we have under a different elastic modulus for the adhesives ,we work primarily with:

  • E - elastic modulus of normal stress or Young's modulus

  • G - shear elastic modulus

The modulus of elasticity is used in the elastic zone adhesive, compliance the Hooke law.

hooke law

Yield

The yield strength of an adhesive is defined as the maximum tension, stress, load or elongation which allows an adhesive, so that removal of the load once the adhesive completely recovers its original shape.

The elastic limit defines the elastic and plastic behavior of the adhesive.

All values of the mechanical properties of adhesives are obtained by the destructive testing, where the curve represents the stress / strain of the adhesive.

adhesive properties

The curves stress / strain are obtained in the destructive testing of adhesives and hence their mechanical properties vary according to:

  • Speed Test - test at higher speeds, the adhesive becomes in a rigid behavior.

  • Temperature Test - The mechanical properties of adhesives are very sensitive to temperature, glass transition temperature of each defines its behavior as elastic or rigid material, this temperature is unique for each adhesive.

  • Fillers and adhesive additives - the use of fillers or additives specifics vary the mechanical properties of the adhesive.
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