Test purpose
CAI is used in the characterization of the plane or a car in was hit by a bird or stone, or damaged material damage in the accident.
The principle of the experiment is: the first to impact damage of sample, and then use ultrasonic testing, the residual compression strength can be determined through compression test at last.
So, after the shock compression test consists of two parts:
- Of the sample by instrumented drop weight impact test enginery impact damage
- Using static testing machine to measure residual compression strength of compression test
Prestressing loss of sample
- usingHIT 230 fInstrumented drop hammer impact testing machine under the predetermined conditions to impact damage the sample.Sample clamp sample size is as follows:
- 76.2 x 127 mm (ASTM, Boeing, SACMA, DIN), 75 x 125 mm (EN,airbus) or 140 mm diameter circular (CRAG).Only airbusAITMStandards for clamping impact position.In order to facilitate test, can be gripped sample first, then the sample and test fixture in the testing machine.
- Drop hammer impact tester instrumented punch can monitor and evaluate the impact of failure process.Impact - time curve, which is the first peak, and laminated plate is associated with type II fracture toughness.
CAI compression test
USES special compression test equipment to the impact of specimen compression experiment was carried out to determine the residual compression strength.Usually, the test of compression force is very big.
Special compression test equipment can ensure the sample not in compression buckling.The standard of sample specifications are as follows:
- ASTM, Boeing, SACMAandDINFour sides: test equipment as the guide, but not gripped sample.
- ISO, ENAnd airbus standards: sample need holding both ends up and down, four sides of the sample and test equipment for the linear contact.
CAI compression test fixtures (compression after impact)
- Application:According to the following criteria determine the residual compression strength after impact load (CAI) :
- Boeing BSS 7260 c, ASTM D7137, DIN, ISO 18352, prEN 6038 65561
- Airbus AITM 1-0010 3rd edition
- Function description:Compression test equipment used to measure the residual compression strength after impact load.Test, in the sample surface compressive force.Sample is holding, or only in the upper and lower end support, depending on the version.
- Advantage:
- Sample is easy to change
- Tooling applicable temperature range, from 70 to 300 ° C
- Through the lateral stiffness of the supporting plate increases
- Up and down the contact surface of the carbide insert interchangeable
After the shock compression experiment was carried out according to ASTM D7137 standard (CAI)
In compression after impact (CAI) process, the use of up to 600 kN special compression test fixtures on impact of composite sample for testing.useZ600E material testing machineAt 60 ° C to + 350 ° C temperature range of the CAI experiment was carried out.
