Regardless of the quantity, a "negative" vector doesn't exist. In this case, the displacement in the region shown is actually to the left. Solidworks chose to draw a vector to the right with "negative magnitude" instead of drawing a vector to the left.

Vector plots in simulation are somewhat questionable. I think I have a couple of posts regarding vector plots which to this day I disagree with the results. Good luck on getting anywhere with this.

I don't know if answered is the right word. Regarding angles, I think we all know we can calculate them; perhaps the suggestion here is that Solidworks could do the calculation for us.

It is also impossible to probe a node and have the displacement displayed as an angle about an axis rather than just translation. Yes, I can measure the distance and do it myself, but it wouldn't hurt if Solidworks could do it---after all, you can specify displacements as translations or rotations, so why shouldn't we also be able to measure them both ways?

I know you did and it's somewhat valid. It still bothers me though that the principal stress doesn't line up with the principal strain. It is a purely tensile analysis. I'm not much of a math person so I don't have the equations to back up the results.

If I plot magnitude, the vectors point to the left, which is the correct direction, because displacement magnitude is always a positive number. What some people here aren't getting is that if I have a vector plot of any quantity, and the color code corresponds to the quantity the vector is showing, there should never be negative values in the scale.

For example, if the case is such that a vector shows the XY displacement but the color represents Z, then yes, it's prefectly plausible to have negative numbers on the scale.

But if I define a plot of X displacement (as I did) and want it shown as vectors (however redundant that is) then I should never get a displacement in the negative X direction as a vector pointing in the positive direction but with negative magnitude. That just doesn't make any sense!

Actually it makes perfect sense. In nearly every class I took involving vectors (physics, statics, dynamics, fluids, thermo), a negative vector value meant it was in the opposite direction of the arrow. Usually this occured in the context of solving for a vector of unknown direction.

It may offend your senses, but mathematically it does make "sense".

In your case, it appears the only function of the vector arrows is to indicate the positive direction of X.

You are right---mathematically, the result is correct. However visually, in a plot, vectors should never have negative magnitude---if they do, they should point the other way!

Something is definitely not right. At first I thought maybe the vectors represented resultant displacement, while the color represented X displacement. However, this does not explain why the vectors are then facing the wrong way.

Conversely, if the vectors and the color both represent X displacement, as the color legend and their direciton indicate, then there's no explanation as to why the vectors are not all parallel to the X direction. This part flexes in a rotational manner and in the figure you can clearly see the rotation implied by the vectors.

I get your point (pardon the pun), Emilio, and have from the first time that I had read it the other day. I would suggest that you send this in as an SPR through your local VAR. I will do the same.

Regardless of the quantity, a "negative" vector doesn't exist. In this case, the displacement in the region shown is actually to the left. Solidworks chose to draw a vector to the right with "negative magnitude" instead of drawing a vector to the left.

Vector plots in simulation are somewhat questionable. I think I have a couple of posts regarding vector plots which to this day I disagree with the results. Good luck on getting anywhere with this.

https://forum.solidworks.com/thread/25804?tstart=0

https://forum.solidworks.com/thread/22667?tstart=0

I don't know if answered is the right word. Regarding angles, I think we all know we can calculate them; perhaps the suggestion here is that Solidworks could do the calculation for us.

It is also impossible to probe a node and have the displacement displayed as an angle about an axis rather than just translation. Yes, I can measure the distance and do it myself, but it wouldn't hurt if Solidworks could do it---after all, you can specify displacements as translations or rotations, so why shouldn't we also be able to measure them both ways?

I know you did and it's somewhat valid. It still bothers me though that the principal stress doesn't line up with the principal strain. It is a purely tensile analysis. I'm not much of a math person so I don't have the equations to back up the results.

If I plot magnitude, the vectors point to the left, which is the correct direction, because displacement magnitude is always a positive number. What some people here aren't getting is that if I have a vector plot of any quantity, and the color code corresponds to the quantity the vector is showing, there should never be negative values in the scale.

For example, if the case is such that a vector shows the XY displacement but the color represents Z, then yes, it's prefectly plausible to have negative numbers on the scale.

But if I define a plot of X displacement (as I did) and want it shown as vectors (however redundant that is) then I should never get a displacement in the negative X direction as a vector

pointing in the positive directionbutwith negative magnitude. That just doesn't make any sense!Actually it makes perfect sense. In nearly every class I took involving vectors (physics, statics, dynamics, fluids, thermo), a negative vector value meant it was in the opposite direction of the arrow. Usually this occured in the context of solving for a vector of unknown direction.

It may offend your senses, but mathematically it does make "sense".

In your case, it appears the only function of the vector arrows is to indicate the positive direction of X.

Roland,

You are right---mathematically, the result is correct. However visually, in a plot, vectors should never have negative magnitude---if they do, they should point the other way!

Something is definitely not right. At first I thought maybe the vectors represented resultant displacement, while the color represented X displacement. However, this does not explain why the vectors are then facing the wrong way.

Conversely, if the vectors and the color both represent X displacement, as the color legend and their direciton indicate, then there's no explanation as to why the vectors are not all parallel to the X direction. This part flexes in a rotational manner and in the figure you can clearly see the rotation implied by the vectors.

I get your point (pardon the pun), Emilio, and have from the first time that I had read it the other day. I would suggest that you send this in as an SPR through your local VAR. I will do the same.