Ryan Manning
New member
I am 90% sure I am on the right track to working out the Modulus of Elasticity for a tensile test.
I need to know a bit more about Strain, elongation and extension.
To get the Modulus of Elasticity I have to calculate Stress divided by Strain in my case Stress = 355MPa but the strain is hard for me to work out.
I know the formula but I guess I am doing something wrong. If my total elongation is 10/50 that equals 20% elongation but All of the graphs that I have come across show the strain figures to be 0.002, 0.004, 0.006, 0.008, 0.01, 0.012 and so on.
I think 20% can also be expressed as 0.20 and if i measure the point of my elastic limit proportionally to 0.20 as the total elongation it equals to 0.04.
For Modulus of elasticity if I calculate 355 divided by 0.04 = 8875 MPa (or 8.75 GPa)
but if somehow the strain figures had another 0 such as 0.004, 0.006, 0.008 etc then my calculations would work out.
355 Divided by 0.004 = 88750 MPa (or 88.75 GPa) which is in the range for the Modulus of Elasticity for Brass.
In Summary I know the total elongation amount is 20% but how can I express these figures as 0.002, 0.004 (etc)
I guess I can't post any images here of my graph but my email address is [email protected] and if you are able to email me I can send you the graph.
Thank you.
I need to know a bit more about Strain, elongation and extension.
To get the Modulus of Elasticity I have to calculate Stress divided by Strain in my case Stress = 355MPa but the strain is hard for me to work out.
I know the formula but I guess I am doing something wrong. If my total elongation is 10/50 that equals 20% elongation but All of the graphs that I have come across show the strain figures to be 0.002, 0.004, 0.006, 0.008, 0.01, 0.012 and so on.
I think 20% can also be expressed as 0.20 and if i measure the point of my elastic limit proportionally to 0.20 as the total elongation it equals to 0.04.
For Modulus of elasticity if I calculate 355 divided by 0.04 = 8875 MPa (or 8.75 GPa)
but if somehow the strain figures had another 0 such as 0.004, 0.006, 0.008 etc then my calculations would work out.
355 Divided by 0.004 = 88750 MPa (or 88.75 GPa) which is in the range for the Modulus of Elasticity for Brass.
In Summary I know the total elongation amount is 20% but how can I express these figures as 0.002, 0.004 (etc)
I guess I can't post any images here of my graph but my email address is [email protected] and if you are able to email me I can send you the graph.
Thank you.