3 years ago

Ayuda porfavor es para una tarea de mi capacitación de desarrollo microempresarial

Engineering

1 answer:

vovangra [49]3 years ago

3 0

Answer:

I'm a beginner I would hv helped

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2 years ago

Thermosets burn upon heating. a)-True b)- false?

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Answer:

true

Explanation:

True, there are several types of polymers, thermoplastics, thermosets and elastomers.

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A fatigue test was conducted in which the mean stress was 90 MPa (13050 psi), and the stress amplitude was 190 MPa (27560 psi).

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b) -100MPa

c) -0.35

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Explanation:

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mean stress $\sigma_m = 90MPa$

stress amplitude $\sigma_a = 190MPa$

a) $\sigma_m =\frac{\sigma_max+\sigma_min}{2}$

$90 =\frac{\sigma_{max}+\sigma_{min}}{2}$ --------------1

$\sigma_a =\frac{\sigma_{max}-\sigma_{min}}{2}$

$190 = \frac{\sigma_{max}-\sigma_{min}}{2}$ -----------2

solving 1 and 2 equation we get

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b) $\sigma_{min} = - 100MPa$

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d)magnitude of stress range

$=(\sigma_{max} -\sigma_{min})$

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