What is the Breaking strength and Elongation at break?

Definition:

Breaking Strength：In the process of tensile testing under specified conditions, The ratio of the maximum force recorded by the specimen being pulled to the linear density,See ordinate 1 in below picture.

Elongation at break: The elongation of the specimen under the action of maximum force, as shown the abscissa 4 in above picture.

What is the relationship between them?

Breaking strength and elongation at break are two important physical quantities that represent the mechanical properties of textiles or fabrics.

The fracture of textiles with a small range of yield belongs to the classical theory of linear elastic fracture mechanics.

The fiber in the yarn is affected by various factors in the textile process, which makes the yarn have invisible cracks. When the yarn is woven into the fabric, it will be pulled by certain external forces, and these cracks will be enlarged macroscopically, which will cause the fabric to break or tear.

So textiles or fabric rupture strength and the degree of density, thickness of yarn and spinning technology has a direct relationship, and elongation at break is essentially depends on the types of fiber, for the high Young's modulus of fiber its corresponding high elongation at break, second fiber morphology, degree of orientation and crystallization degree also can have a certain effect.

The Difference?

Perhaps many people wonder: what is the difference between breaking strength and tearing strength?Breaking strength measures the force required to produce a tear in the fabric; and tear strength is the force required to further tear the crack under the external force.Both of them are important mechanical indexes, which are related to each other and different from each other.

There are many methods for breaking strength testing, such as the strip method and catch sample method.We will introduce the bar test method, the test standards:ISO13934-1 《Textiles— Tensile properties of fabrics— Part 1: Determination of maximum force and elongation at maximum force using the strip method》

GESTER tensile testing machine for fabric strip method is used for testing mechanical properties of various textiles, such as stretch, tear, top break, constant elongation, constant load, elasticity, seam slip, stripping, etc.And widely used in rubber, plastic, leather, metal, wire, paper, packaging, building materials, petrochemical, electrical, geotechnical materials tensile, compression, bending, bonding, stripping, tearing, breaking, creep test force value, elongation, deformation test.

Testing range: 10N, 20N, 50N, 100N, 200N, 500N, 1KN, 2KN, 5KN optional.

Test results: Sample from the jaw fracture within 5 mm, as jaw fracture, when finished 5 pieces of sample design, if the value is greater than the smallest jaw fracture "normal" can be preserved, if less than the minimum "normal" should be abandoned, plus a test to get five "normal", if all test results are jaw fracture, should be noted in the report.