The stretching and winding principle of steel tape measure? The concave section is it. How to analyze it from mechanical angle?I do not know that you have played a small play like, is made of tin, was to go to school to play, about 20cm long, cross section is concave, usually straight, put it a shot in the arm, it rolled around the arm. Please explain it with mechanical knowledge!
Made of a concave, with a certain rigidity, because the concave can make the ruler straight, not easy to bend.
Stretch: pull with your handSong: there's a spring in itConcavity: if it is flat, the drawn ruler is easy to bend and not good enough to measure. So it is concave and can keep a straight line in a certain lengthThank you
Pulling out is concave, but it's flat when retracted!It is made of concave, so as to have a certain rigidity when it is pulled outWhen it retracted, a trough flattened it, because the steel was elastic, so after pulling it out, it was still concave!Elastic deformation occurs at the mechanical angleCan be understood as a spring deformation occurs the same principle!
