Failure Analysis

Ceramatec has several decades of exeperience in testing ceramics and conducting post-test failure analysis.

Our expertise & failure analysis techniques used include fracture analysis, leak check, optical microscopy, electron microscopy, mechanical testing, burst strength, c-ring test, and non-destructive testing using sounds waves.

The primary function of the Reliability & Failure anaylsis is to develop and validate the experimental and analytical methodology required for the prediction of the reliability of a variety of ceramic components under development at Ceramatec. The reliability methodology is based on a well established weakest link concept which describes failure in terms of the largest defect present within the component as well as changes in the defect population arising from various time-dependent processes including slow crack growth, creep, and deleterious environmental reactions (Figure 1). In areas where stress concentrations control failure, a fracture mechanics approach is often required to supplement this approach. The CRG uses this approach to

Predict reliability of components operating under nominal conditions
Optimize these operating conditions with respect to maximizing the reliability
Quickly assess changes in component design on reliability

In addition to reliability analyses, the reliability group also specializes in failure analysis including destructive (Figure 2) and non-destructive analyses. Our primary tool for nondestructive evaluation is the Scanning Acoustic Microscope (SAM), which is shown in Figure 3. The SAM has the ability to create images by generating a pulse of ultrasound, which is focused to a relatively small spot (size depends on transducer). The pulse is sent into a sample and reflected off of various interfaces. Return echoes arrive at different times based upon the depth of the reflecting feature and the velocity of sound in the materials (Figure 4). The operator positions an electronic gate to capture the depth of interest. An image based on the returning intensity is created by scanning the transducer over a pre-defined area in the sample. Figure 5 summarizes several capabilities of the SAM with respect to materials characterization.

For further information or inquiries, please e-mail: CRG@ceramatec.com

Figure 1: Key Elements of Life Prediction Analysis

Figure 2: Examples of Destructive Analysis

Figure 4: Operating Principle of the SAM

Figure 5: Application Areas for the SAM