f*********e
发帖数: 71 | 1 老板说在applied mechanics里，这两个词完全等同，偶认为应该也可以指displacement
吧？ |
s*i
发帖数: 5025 | 2 小鱼，说说。别就知道抢号呀。
mechanics里，这两个词完全等同，偶认为应该也可以指displacement
【在 f*********e 的大作中提到】
: 老板说在applied mechanics里，这两个词完全等同，偶认为应该也可以指displacement
: 吧？
|
t*****a
发帖数: 4 | 3 I think your advisor is at least partly right.
Displacement is not strain. Suppose two points in a body has the same
displacements vectors, there is no strain. Of course, strain is something you
can measure, deformation is a more general word. Nevertheless, I think your
advisor is roughly right.
mechanics里，这两个词完全等同，偶认为应该也可以指displacement
【在 f*********e 的大作中提到】
: 老板说在applied mechanics里，这两个词完全等同，偶认为应该也可以指displacement
: 吧？
|
s***n
发帖数: 821 | 4 Deformation is also sth you can measure.
Wherever there is deformation there is strain;
wherever there is strain there is deformation.
Strain can be viewed a measure of deformation. For
the same deformation, you can have different strain measures.
However in the following sense, they are totally equivalent,
small/finite strain = small/finite deformation.
【在 t*****a 的大作中提到】
: I think your advisor is at least partly right.
: Displacement is not strain. Suppose two points in a body has the same
: displacements vectors, there is no strain. Of course, strain is something you
: can measure, deformation is a more general word. Nevertheless, I think your
: advisor is roughly right.
:
: mechanics里，这两个词完全等同，偶认为应该也可以指displacement
|
f*********e
发帖数: 71 | 5 Good! It does make sense.
【在 s***n 的大作中提到】
: Deformation is also sth you can measure.
: Wherever there is deformation there is strain;
: wherever there is strain there is deformation.
: Strain can be viewed a measure of deformation. For
: the same deformation, you can have different strain measures.
: However in the following sense, they are totally equivalent,
: small/finite strain = small/finite deformation.
|
t*****a
发帖数: 4 | 6 For example when?
For
the same deformation, you can have different strain measures.
【在 s***n 的大作中提到】
: Deformation is also sth you can measure.
: Wherever there is deformation there is strain;
: wherever there is strain there is deformation.
: Strain can be viewed a measure of deformation. For
: the same deformation, you can have different strain measures.
: However in the following sense, they are totally equivalent,
: small/finite strain = small/finite deformation.
|
k*****a
发帖数: 1518 | 7 for large defomation and/or large srain case only.
depending on different configurations such as current configruation,
intermediat configuration etc, there are different strain measures such as
green, 1st and 2nd kirchhof and so on.
【在 t*****a 的大作中提到】
: For example when?
:
: For
: the same deformation, you can have different strain measures.
|
s***n
发帖数: 821 | 8
Not true, you even can define a strain measure yourself. Also you can apply
your strain measure at any strain level. They are not limited to large strains.
Some of the strain measures are:
Green deformation tensor (Right Cauchy-Green tensor) C = transpose(F)F
Left Cauchy-Green tensor b= F tran(F)
C is a material strain tensor,
and b is a spatial strain
【在 k*****a 的大作中提到】
: for large defomation and/or large srain case only.
: depending on different configurations such as current configruation,
: intermediat configuration etc, there are different strain measures such as
: green, 1st and 2nd kirchhof and so on.
|
t*****a
发帖数: 4 | 9 So, it is like different measurement methods for the same physical phenomena?
Like Celcius and Fahrenheit for the same temperature? or maybe engineering
strain and true strain for the same deformation? If that is the case, then
deformation still = strain right? although you can have different numbers or
ways to represent the same thing. Still confused. |
