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05 Sep 2015

Mechanical analysis houston
Cause failure analysis testing of metal products makes use of macroscopic and microscopic examination methods, along with other investigative tools including nondestructive testing, mechanical testing and chemical analysis. The failure analysis investigation focuses on the metallurgical aspects of the failure. They normally do not emphasize factors including stress or load distributions. The steps followed, the order of the steps and the failure analysis services performed within a failure investigation can vary depending on the type of failure being investigated.

Mechanical forensic engineering houston
Collecting and Assembling History
The root cause failure analysis investigation must start by obtaining pay-to-click sites the failure. This consists of collecting available information regarding the manufacturing, processing, fabricating method, fix history of the failed component. Processing fix records, pertinent codes, specifications and related standards, and also specifications, drawings, and style criteria should be included. Data ought to be provided about the material used, mechanical properties, heat treatment, and then any surface preparation including cleaning, grinding, plating or painting. The service history will include the date, time, temperature, and environmental conditions in the component.

In addition to collecting the history information, photographs from the failed component and also the failure site should be taken. These photographs will document the positioning and type of failure and may become part of the permanent record with the failure.

Nondestructive Testing
Nondestructive testing are needed in failure investigations, particularly magnetic particle inspection for ferrous metals, liquid penetrant inspection, and ultrasonic inspection. These inspection methods are widely-used to detect surface cracks and discontinuities. Radiography can be used to examine components for internal discontinuities, for example voids and porosity.

Visual Examination
Prior to the investigator can check out the failed component, it needs to be isolated and protected from further damage. The component has to be handled carefully and has to be sheltered on the corrosive environment to preserve the failure.

Your analysis should begin with a visual study of the failure site and part. All observations ought to be recorded or photographed and information must be gathered prior to the part is cut for destructive testing. The visual examination should include inspection of the fracture faces and crack paths, with an assessment of abnormal conditions or abuse how the part endured during its service life.

Macroscopic Examination
Macroscopic examination can be an extension of the visual examination and evaluates quality and homogeneity in the part. It is accustomed to determine the origin of the failure and the kind of fracture such as ductile, brittle, torsion or fatigue. Macrostructural features enables you to assess internal quality, existence of hydrogen flakes, chemical segregation, hard cases, flow lines and welds.

Mechanical Testing
The mechanical properties of the metal can be used to determine the plethora of usefulness and the service that could be expected from the material. Mechanical testing services appraise the strength, ductility and other physical properties of materials under various conditions, like temperature, tension, compression, impact and load.

Metallurgical Examination
Metallurgical examination is performed to determine microstructural features for example inclusion content, grain size and rolling direction. Metallographic examination involves the use of high magnification microscopy. These examinations might include optical as well as scanning electron microscopy. Optical microscopic examination is utilized to determine grain size, microstructure and inclusion type and content. On the other hand, scanning electron microscopy is used to find out abnormalities, such as inclusions, segregation, and surface layers, as well as fracture features and, with the use of energy dispersive analysis, can identify inclusion type and corrodents for the fracture face. Microhardness testing is performed to measure case depths, evaluate cold work, determine weld quality and see mechanical properties of small parts.

Chemical Analysis
Inside a failure investigation, chemical analysis is carried out routinely to ensure that the material is what was specified. Together with obtaining the bulk composition in the material to confirm the grade used, it might be necessary to analyze surface contaminants. Chemical analysis is performed on the base material along with corrosion products, deposits or coating layers.

Simulation Tests
It sometimes may be helpful to determine the main cause of the failure by means of testing that simulates the conditions under which the failure occurred. The simulation may provide information for the suitability of the material for the environment and can also what is heat treatment or performance with the part in a controlled environment including salt spray. Certain kinds of simulation tests require accelerated testing in order to obtain information inside a reasonable time. Interpretation of accelerated tests must be done with care for the reason that limitations of the tests need to be recognized.

Data Analysis, Conclusions and Report
After the completion of the outlined steps, the investigator ought to be ready to interpret and summarize the information that has been collected. Many of the work performed might not exactly contribute in determining the main cause of the failure, yet it could be helpful in eliminating some possible causes. When combined, the steps that were outlined will, generally, enable the investigator in summary the root cause of the failure. The failure analysis report must provide the following:

� Description in the failed component
� Conditions during failure
� Background service history
� Mechanical and metallurgical data concerning the failed part
� Evaluation with the material quality
� Discussion of mechanisms that specify the cause of the failure
� Recommendations for prevention of future failures or for action to be taken sticking with the same parts


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