NAFEMS does not guarantee that your individual board will accept these courses for PDH credit, but we believe that the courses comply with regulations in most US states (except Florida, North Carolina, Louisiana, and New York, where providors are required to be pre-approved) *It is your individual responsibility to check whether these e-learning courses satisfy the criteria set-out by your state engineering board. Traditional welding classifications and calculations.Traditional lug failure modes and calculations.Fatigue and Fracture Mechanics of bolts and rivets.Detailed modeling of bolts and rivets in linear and nonlinear analysis.Overview of application and methodology.Usage with linear and nonlinear contact surfaces.‘freezing’ of elements to induce pre-strain.Inter-rivet buckling and other instabilities.Solid element representation with spider (nugget or bolt section).Shell element representation with spider.Line element representation with spider.Different approaches between rivets and bolts.Overall Stiffness and load path assumptions.Rigid and flexible spider elements used in bolt and rivet loading distribution.Review of practical designs and applications. If you are interested in additional pricing to call-in using a toll-free line, please send an email to: e-learning headset connected to the computer via headphone and microphone jacks) or by calling into a standard toll line. Students will join the audio portion of the meetings by utilizing the VoIP (i.e. Full notes are provided for the students, together with personal passwords for e-learning backup material, bulletin board access etc.Students are welcome to send in problems from industry and these will be discussed as time permits.The tutor will be showing analysis results interactively and involving the students in the process via Q and A periods during each session, follow up emails and a Course Bulletin Board The mapping to Finite Element analysis techniques is shown with numerous workshops. The math is kept simple and the emphasis is on practical examples from real life to illustrate the topic. No software is required.Įach topic in the class is treated as a building block and is presented using an overview of the physics and theory involved. The course is completely code independent. The e-learning course runs over a 3 week period with a single two-and-a-half-hour session per day (with one week break). The objective of this course is to review the various connection and joint technologies in use, give an overview of the physics involved and show how to successfully implement practical solutions using Finite Element Analysis. Modeling of weld features to get a reasonable estimate of stress concentrations at the weld toe can be problematic do we model with a fine detailed 3D model, or use a ‘hot spot’ type of approach? In some cases, the interaction between the connectors and the surrounding structure is critical, as in the case of pre-loaded bolts and inter-rivet buckling. This would certainly be the case with main attachment fittings for example. It may be that the assessment of the local behavior of the connector is essential to the safety case. However, there may be doubts about the local flexibility and load paths developed with this assumption. In many cases, the details of each individual connection can be ignored if an overall stiffness or strength assessment is to be made and the connection is assumed reasonably continuous. The engineer is faced with an often difficult decision when attempting to simulate such connections and joints within a Finite Element Analysis (FEA). These may well exist as the sole means of load transfer or be supplemented by mechanical connections such as bolts or rivets. Alternative forms of connection are welds joints and bonded joints. Significant discrete load paths are formed by lugs and pins, clips or similar connectors in many structures across a wide range of industries. Traditional fabricated structures have used many thousands of bolts and rivets to connect components together in a continuous manner, in the case of ships and aircraft the total can run into millions.Įven today many structures rely on this type of technology – for example, the use of spot welds in a modern road vehicle. Most structures involve some form of jointing or connection. Practical Modelling of Joints and Connections
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