What is Young Modulus, datum, datum geometry and poisson's ratio?

Question

What is Young Modulus, datum, datum geometry and poisson's ratio.

Please explain clearly and provide relevent concepts when necessarily.

Answer 1

For Young's modulus and Poisson's ratio, see references 1 & 2. Datum geometry is defined in ref. 3.

Answer 2

Datum is an arbitrary reference component that's oftentimes assigned a value of 0. case in point, in case you desire to be attentive to the top of a mountain height, you are able to say it somewhat is "xyz" m above propose sea point. to that end you're taking propose sea point as your datum. you're giving the top of all different factors with connection with propose sea point. youthful's modulus is the ratio of the stress to rigidity in a textile. it somewhat is often taken interior the elastic area of the stress-rigidity curve of the fabric. (the gradient of the at as quickly as area of the curve) whilst a textile is project to a rigidity, it deforms interior the longitudinal course (i.e. alongside the path of the utilized rigidity) as properly as interior the lateral course (i.e. perpendicular to the line of action of the rigidity. subsequently, there is the two longitudinal and lateral rigidity. The Poisson's ratio is the ratio of the lateral rigidity to longitudinal rigidity in a textile.