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  1. engineer121394

    Section modulus ratios

    My understanding about section modulus ratios: -given a dimensional deviation or surface flaw on a structure, a section modulus ratio can be used to scale linearized stresses at a cutline (stress classification line) on an FEA model rather than re-running the model. -area ratios can scan primary...
  2. engineer121394

    Understand local vs gross structural discontinuities

    could someone please help explain to me what the difference is between gross structural discontinuities and local structural discontinuities? My understanding so far is that gross discontinuities affect the entire stress profile (i.e. changes in wall thickness) and local only effects a small...
  3. engineer121394

    Shakedown strain hardening question

    My understanding is that during shakedown cyclic loading will cause a structure to initially plastically deform, but strain hardening will allow the structure to shakedown into elastic action. The limit for this is 3*Sm (generally 2*Sy). What if the part is made of material that is strain...
  4. engineer121394

    Shakedown question

    if I have a structure that has negative margins for primary stress, but positive margins for primary stress + secondary stress, will the structure shake down into elastic action? My understanding is no because primary stress are not self limiting and therefore the structure will yield to failure.
  5. engineer121394

    Trying to understanding primary plus secondary stress difference range and why we evaluate it.

    Here is my understanding so far: -Design stress, or allowable stress (Sm) is “typically” (ultimately depending on the application, and assuming Su is not limiting) 2*Sy/3 -primary stress (P) is result of external loading (weight, pressure, shock etc.) The limit is Sm -secondary stress (Q) is...
  6. engineer121394

    How do you know when your are ready to make a big career change

    Hello again everyone, I’m possibly about to make a big career change that is pushing me far out of my comfort zone. I work at a contract manufacturer. I do a lot of small contract design projects and I work with mostly electrical engineers (as a mechanical engineer) I have worked for this...
  7. engineer121394

    Damping coefficient selection for simulation

    I am trying to us SolidWorks Simulation linear dynamics for vibration analysis. However, it appears that damping is calculated by manually selecting a viscous damping coefficient rather that calculating the the damping from each material. Is there any way that I can estimate a global damping...
  8. engineer121394

    Changing job etiquette

    Hello all, I am currently looking for a new job. I have been on and off about leaving my job for a while now. Some of the work I don’t find enjoyable(which I understand will be at every job), and I’m finding that I dislike the company goals and culture (engineers are mainly used as production...
  9. engineer121394

    How to improve confidence and analysis paralysis

    Hello again everyone, When faced with life/career struggles, the obvious solution nowadays is to spill your guts to random stranger online via anonymous profile lol. Here goes… I am 27 going on 28. I am a few years into my career as a design engineer (started out with two years as a test...
  10. engineer121394

    NEW JOB ANALYSIS

    QUESTION: Should I look for a new job PROFESSIONAL BACKGROUND: -education: BSME -current job: Systems Design Engineer -previous jobs: test engineer (same company) DESCRIPTION OF CURRENT COMPANY: -Turnkey contract manufacturer that specializes in PCBA, cable, and box build products...
  11. engineer121394

    Is it normal for engineers to get pulled to work production

    Hello all, I am a design engineer that works at a turnkey contract manufacturing company. I am four years into my career, and this is the only company that I’ve worked for. I started out as a test engineer, then got promoted to design engineer. Part of my job is to work on contract design...

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