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The four point bending flexural test provides values for the modulus of elasticity in bending, flexural stress ,flexural strain and the flexural stress-strain response of the material. This test is very similar to the three point bending flexural test. The major difference being that the addition of a 4th bearing brings a much larger portion of the beam to the maximum stress, as opposed to only the material right under the central bearing.
This difference is of prime importance when studying brittle materials, where the number and severity of flaws exposed to the maximum stress is directly related to the flexural strength and crack initiation.
It is one of the most widely used apparatus to characterize fatigue and flexural stiffness of asphalt mixtures.
Four point flexural testing fixtures have two base supports and two top loading points. There are two types of 4 point bend tests based on where the load contact points are on the sample. The first type divides the sample into three parts and the loading points are placed at 1/3(L) apart. The second test splits the sample into four parts and the two top points are at 1/4(L) and 3/4(L).
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
Lower span (adjustable).
Roller.
Connection pin.
ASTM C78 Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
ASTM C293 Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
ASTM C1161 Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
ASTM C1211 Flexural Testing for Ceramics
ASTM C1583 Tensile Testing for Concrete Surfaces
ASTM C1674 Ceramic Flexural Strength Test Equipment
ASTM D143 Standard Test Methods for Small Clear Specimens of Timber
ASTM D3043 Standard Test Methods for Structural Panels in Flexure
ASTM D6109 Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastic Lumber
ASTM D198 Standard Test Methods of Static Tests of Lumber in Structural Sizes
ASTM C1341 Standard Test Method for Flexural Properties of Continuous Fiber-Reinforced Advanced Ceramic Composites
ASTM D5572 Standard Specification for Adhesives Used for Finger Joints in Nonstructural Lumber Products
ASTM D6109 Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastic Lumber
ASTM D6272 Four Point Flexural Bend Test Machine for Plastics and Insulating Materials
ASTM D6416 Flexural Sandwich Composite Plate Composite Test Machine
ASTM D7264 Flexural Test Equipment for Polymer Matrix Composite Materials
ASTM D790 Testing for Flexural Properties of Plastics and Insulating Materials
ASTM F2606 Bending Balloon Vascular Stents 3 Point Test Machine
ASTM F382 Flexural Fatigue Bone Plate Fixation Devices Test Equipment
ISO 178 Plastics-Determination of Flexural Properties
ISO 14125 Plastic Composites Flexure Bend Test Machine
ISO 3133 Wood -- Determination of ultimate strength in static bending
JEDEC JESD 22B113 Board Level Cyclic Bend Test - Handheld Electronic Products
IPC JEDEC 9702 Monotonic Bend Testing Interconnects - Board Level