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Hi, I understand from the textbook "Designing with Plastic, Erhard", yield strength is the peak of Stress Strain curve, where the slope is zero. I would like to check if this means before reaching to the top, it is still elastic for plastic? As if compared to metal, the peak of the stress...

Under static condition, the bolt hole stress shows some stress above yield, localized, the stress near the bolt head is below yield... Should we use tensile strength instead of yield to do margin of safety check? I see the area underneath bolt head may experience little yield under bolt...

I am required to check a fatigue life for a connector holding two parts under an acceleration in mini seconds. I wonder if this should be HCF? I have done HCF and LCF for other product, call it A, but the load condition is different. Product A experiences Temperature, Pressure and Acceleration...

I am modeling a cantilever beam to carry a weight with a support (black line). I want to check the impact of modeling the hinge at the end... if I use MPC element to allow rotation, I can almost two times deflection downwards from frictional contact at the hinge. I understand in reality, there...

Hi, anyone has used gap condition in dynamics analysis such as transient? I wonder if it is comparable to use full transient with contact elements than gap condition? Thanks!

Hi All, I am trying to compare using FEA results to calculate the bolt forces with the hand calculation from Shigley example... but I can't match it... I extract the forces and also moment... but I am not sure if the FEA results are correct although summation of forces are matching to applied...

Hi, I have a case that the metal rod being bent to L shape and continue to pull it. There is no heat treatment and there should be residual stress after bending into L shape. If I run two analysis separately, 1. plastic deformation to get the total strain;2. max stress/ strain when the L hook...

Hi, would like to ask in actual case, would there be any friction in sliding direction? I assume no or very insignificant as it is allowed to slide...

Hi all, I understand we don't take stress at the boundary condition especially SPC. What if I apply displacement across an area, is the stress at this area valid for assessment? Thanks!

Hi, I would like to check how would you assess the plastic deformation for mild steel material? If I am running linear analysis, the stress exceeds yield stress and the strain more than elastic limit (Stress/ Modulus) but less than 0.2%. Should I use use elastic limit or 0.2% for the yield at...

I would like to know if a screw is screwing between two parts, is there any preload induced like tightening two parts with Bolt and Nut? Thank you!

Hi, I am modeling a nonlinear material using bilinear. It is a plastic material where stress is dropping after yield point and modulus given in the specification is secant modulus NOT tangent modulus (initial best straight line). I wanted to know for the ANSYS bilinear input below: Modulus...

Hi I wonder if anyone has done any analysis to check if the screw get loosen due to thermal effect? Designer feedback the screw may get loosen due to thermal cycle... and I wonder if the screw is being screwed into the part and locked, how could it get loosen?

If I don't use rbe for predicting the load at fastener... What about using bonded contact? Imagine in lap shear joint, I use bonded contact at the imprint area where it supposed to be bolt shank? There was discussion in the team that this is quick and dirty way to check the joint strength but...

Hi, I would like to know how to extract the loads at different time steps in static analysis. Is it directly from CFD simulation? For example, in the static analysis I performed in ANSYS, I received many static loads at different time steps from taxing, climbing, cruising, landing. Each time...

Anyone has the experience of using Hotmetl and Double Sided Tape? Considering both for the option to bond two plastic parts (non-structural parts).

Hi, If I only have S-N Curve for kt=1 and the maximum stress is at the corner radius, can I use the nominal stress for the unnotched S-N Curve?

Hi All, I am working on a plastic material with YS = 30MPa,Yield Strain is 2.5%. Modulus is 3400 MPa. I got a stress-strain data (engineering stress-strain) and I want to calculate plastic strain. The modulus given in the spec is initial modulus and I measured 0.2% from the stress-strain...

Hi All, I understand that we always use 1E-6 for the moment of inertia when using mass element but I wonder why using 1E-6 or not to calculate an exact value? Secondly, is there any cases that we will use RBE2 to transfer the load? As in to simulate a non-deformable load distribution? Thank you!

Hi, Wonder how do you perform adhesive analysis or simulation? Do you just pick up the stresses from the FEM and compare against the adhesive strength or running a cohesive simulation? If the product is also subject to vibration condition, how to account for the dynamics effects?