adouglas089
Mechanical
Can anyone help me with this?
I need to build a wall which is two layers of polyethylene separated by 200 mm, about ten feet high and filled with water. To prevent the sheets of polyethylene from coming apart, that is to constrain them to approximately 200 mm apart, basically two big buttons- like the buttons on clothing - will be attatched top each sheet, and fishing line used to attach the buttons, piercing the membrane. The size and number of the buttons that I need is the question.
I mean, suppose I have a button every 25 centimeters. At the bottom of the wall the water pressure due to weight of the water is about 10 kPa. So there would be 630 or something newtons exerted per button, and 16 buttons per square meter per side (32 buttons both sides). Ok. The plastic is 150 microns thick. The strength of the plastic is 8 MPa (ldpe vapor barrier from home depot).
What would the diameter of the button need to be too not let the button be pulled through the plastic? (or, the plastic being pushed over it, I guess).
I cannot quite figure this out, my knowledge of the geometry and calculus is too weak.
I suppose that the degree to which the plastic stretched and Bulges forward may have some impact?
It is going to be a soundproof room, building upon the document here:
They used a nicer method to keep the panels together, but I can't do that... I need this for medical reasons and cannot afford to build a room out of concrete or anything else.
I need to build a wall which is two layers of polyethylene separated by 200 mm, about ten feet high and filled with water. To prevent the sheets of polyethylene from coming apart, that is to constrain them to approximately 200 mm apart, basically two big buttons- like the buttons on clothing - will be attatched top each sheet, and fishing line used to attach the buttons, piercing the membrane. The size and number of the buttons that I need is the question.
I mean, suppose I have a button every 25 centimeters. At the bottom of the wall the water pressure due to weight of the water is about 10 kPa. So there would be 630 or something newtons exerted per button, and 16 buttons per square meter per side (32 buttons both sides). Ok. The plastic is 150 microns thick. The strength of the plastic is 8 MPa (ldpe vapor barrier from home depot).
What would the diameter of the button need to be too not let the button be pulled through the plastic? (or, the plastic being pushed over it, I guess).
I cannot quite figure this out, my knowledge of the geometry and calculus is too weak.
I suppose that the degree to which the plastic stretched and Bulges forward may have some impact?
It is going to be a soundproof room, building upon the document here:
They used a nicer method to keep the panels together, but I can't do that... I need this for medical reasons and cannot afford to build a room out of concrete or anything else.
