WHAT IS FEA?
Finite Element Analysis (FEA) based structural stress analysis is a valuable tool in the evaluation and optimisation of product designs for systems involving structural stress due to mechanical and thermal loading. CAD models of the product are used to develop a computer model of the system, which is then subjected to expected load combinations.
The resulting stress distribution and structural deformation may then be obtained and used to assess design safety as well as predict the expected fatigue life of the design. For systems involving dynamic loading, FEA may also be used to obtain the dynamic response of the structure.
Design guidelines and limits from relevant industry standards are used together with the FEA solutions to form an engineering judgement on the design sufficiency and identify any necessary modifications. Using FEA as part of your product design process allows for the rapid and cost effective virtual testing and optimisation of your designs. This will reduce overall product development costs, improve design performance and also give your team greater insights into how your design is likely to respond to a range of operating conditions. SDEA engineers are experienced in applying FEA to a range of industries and application areas.
LATERAL BUCKLING FAILURE DUE TO WIND LOADING
Structural stability is a major issue in wind turbines and other slender structures. Local buckling safety of towers under extreme wind loading conditions is complicated to assess due the high non linear nature of this failure mode. Minimization of tower´s mass may compromises the stiffness and strength levels of the structure especially under abnormal environmental conditions.
PRESSURE VESSEL FEA ANALYSIS
Design by analysis is gradually overtaking the use of more traditional vessel design by rules in the pressure vessel industry. More demanding designs in terms of reliability and safety together with costs of production are responsible for this push towards more advanced design techniques. Increasingly, many large customers also require their suppliers to obtain third party design assessment as a requirement. SDEA engineers have experience in providing third party design validation services to different companies in the pressure vessel industry. We use a robust methodology for pressure vessel calculation covering a range of different failure modes from in-service fatigue failure under cyclic loading to plastic collapse.
The design process conforms with relevant industrial standards like API-6A, ASME VIII-2, EN-13445 and PD-5500. Our engineers then use their extensive technical knowledge to post-process the solution outputs and derive engineering insights. This involves tasks such as peak stress linearization and fatigue life estimation.
Please contact us to find out more about SDEA capabilities regarding the use of FEA modeling of pressure vessels.
STEEL STRUCTURES FEA ANALYSIS
In addition to considering different static load combinations, the dynamic loading on the structure and its vibrational response may also be taken into account in order to assess the structural integrity under transient loading events such as wind storms, earthquakes and mechanical vibration.
Contact SDEA to learn more about our structural analysis and design services and how we can meet your needs.
With increases in computing power and the integration of code guidelines into structural analysis software, the numerical analysis of steel frame structures has become a key stage in the initial design, modification and retrofitting of industrial structures. This has been driven by the increasing complexity of modern designs together with a demand for less conservative and more economical design.
SDEA Solutions are experienced in using modern Finite Element Analysis (FEA) tools to carry out the structural analysis, design and code checking of engineered structures to ASTM, API and EN design codes as well as other industry standards. Global structural modelling is used to obtain overall reactions and component interactions, in addition, more detailed advanced FEA analysis of key connections in order to guarantee their structural integrity.
FEA HISC STRESS ANALYSIS
HISC (Hydrogen Induced Stress Cracking) failure is local embrittlement caused by hydrogen in combination with internal stresses within a ferritic-austenitic duplex stainless steel in subsea equipment with cathodic protection. It is a non ductile failure caused by the interaction of cathodic protection and stresses.
Additional design checks are required to prevent HISC failure modes and ensure safety margins are met over the design life of any component. Our engineering team at SDEA Solutions has extensive experience in providing technical support for HISC assessment to component manufacturers in the oil and gas sector.
FEA based methods are used together with design limits from different industry standards in order to assess design sufficiency and identify any necessary modifications. SDEA engineers are experienced in applying the DNV RP F112 which is the industry standard for ensuring that the probability of Hydrogen Induced Stress Cracking failure is negligible and that the stress state is below prescribed safety levels.
At SDEA Solutions, our team has developed a methodology combining FEA simulation tools together with industry standards to predict the safety margin for any design exposed to potential HISC failure. We work with the client through the whole process from load definition to final checking of the stress levels and give a precise answer on the validation of the design.
Contact us to find out more about Hydrogen Induced Stress Cracking failure prevention and we will be happy to assist you.
FATIGUE ASSESSMENT USING FEA FRACTURE MECHANIC
Engineering assessment of allowable crack sizes is an alternative to fatigue life strength calculations. Industry and standards´recommendations are slowly moving towards this kind of FEA methods. Stress intensity factors and maximum allowable flaw size for a set of given operational conditions is accurate predicted by SDEA using FEA enriched methods.