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plastics 3 points bending grip

plastics 3 points bending grip

ASTM D790, ISO 178

Plastics 3 points bending grip used to measure the flexural modulus or flexural strength of a plastic material, conform with stanard ASTM D790, ISO 178.  Plastic Flexural tests/bending test are generally used to determine the flexural modulus or flexural strength of a material. The material is laid horizontally over two points of contact (lower support span) and then a force is applied to the top of the material through either one or two points of contact (upper loading span) until the sample fails. The maximum recorded force is the flexural strength of that particular sample. 


General introduction

Plastics 3 points bending grip used to measure the flexural modulus or flexural strength of a plastic material, conform with stanard ASTM D790, ISO 178.  Plastic Flexural tests/bending test are generally used to determine the flexural modulus or flexural strength of a material. The material is laid horizontally over two points of contact (lower support span) and then a force is applied to the top of the material through either one or two points of contact (upper loading span) until the sample fails. The maximum recorded force is the flexural strength of that particular sample. 


Test procedure: For ASTM D790, the test is stopped when the specimen reaches 5% deflection or the specimen breaks before 5%. For ISO 178, the test is stopped when the specimen breaks. Of the specimen does not break, the test is continued as far a possible and the stress at 3.5% (conventional deflection) is reported. 


Specimen: 3.2mm x 12.7mm x 125mm (0.125" x 0.5" x 5.0") 

Test Speed:   R = ZL2/6d


where:

R = rate of crosshead motion, mm (in.)/min,

L = support span, mm (in.),

d = depth of specimen, mm (in.), and

Z = rate of straining of the outer fiber, mm/mm/min (in./

in./min). Z shall be equal to 0.01.


Span: for most material "Materials 1.6 mm (1⁄16 in.) or Greater in Thickness" 

the span is 16 times of thickness, mean Span = 16*3.2= 51.2mm.  (Refer standard ASTM D790 section 7)


Test Fixture Loading Noses and Supports: Radius 5mm, diameter 10mm. 

plastics 3 points bending grip

The specimen is deflected until rupture occurs in the outer surface of the test specimen or until a maximum strain of 5.0 % is reached, whichever occurs first.

plastics 3 points bending grip


ISO 178 plastic non-metal 3 point bending Flexure test fixture: Flexure tests/bending test are generally used to determine the flexural modulus or flexural strength of a material. The material is laid horizontally over two points of contact (lower support span) and then a force is applied to the top of the material through either one or two points of contact (upper loading span) until the sample fails. The maximum recorded force is the flexural strength of that particular sample.

Generally, there are two types of flexural test/bending tests: 

3-point bend and 4-point bend. The materials that are tested using the flex test method vary from metal, plastic, wood, laminates, particle board, dry wall, ceramic tile to glass. Bending tests vary greatly based on the product being tested.
 
There are a variety of industry standards which are mostly based on the sample material under test. Flexure test/Bending tests generally involve the measurement of ductility of a sample material. Bending tests may involve taking the sample material to a specific limit and determining the load measurement and its relationship to a load specification (pass/fail). Or, it may involve bending a material until the material experiences a break and determining both the load and deflection required to initiative the break limit.


Features

  • Standard

ASTM D790 Testing for Flexural Properties of Plastics and Insulating Materials
ASTM F2606 Bending Balloon Vascular Stents 3 Point Test Machine

ISO 178 Plastics-Determination of Flexural Properties
ISO 14125 Plastic Composites Flexure Bend Test Machine

Specification

Compression Rating: 1kN / 10Kn , standard up to 300kN, depending on adapter specimen requirement.
Max Sample Span: 300mm or 600mm, or even 3000mm for large specimen
Standard Mandrel Sizes: 10mm, 20mm, 30mm, or customized.
Adapter Couping: 40mm female clevis with 12/16/20mm locking pin

Accessories

Upper loading nose.
Lower span (adjustable).
Roller.
Connection pin.

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