12-28-2019, 01:04 PM
An excerpt from Method analyzes analogue plots of paperboard stress-strain data, USDA Forest Service, Forest Products Laboratory, Tappi/April 1982, Vol. 65, No. 4, pgs. 104-108 & 131-133
ABSTRACT
One of the most important properties of paperboard is characterized by the analogue plot of stress vs. strain obtained from an edgewise compression loading test. A method is given for determining the average stress-strain curve for a group of curves by the use of representative models. An approximate method also allows data to be read from a stress-strain curve so the analysis can be performed with a hand calculator.
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… A method for analyzing continuous trace data (curves) is presented in this paper. To do this the curve is reduced to a two-parameter model. Individual fits between the model and each trace are characterized by the parameter estimates obtained from a regression analysis. Ultimately it is possible to obtain a single pair of parameter estimates representative of all the traces. The accuracy of the results is represented by a confidence region surrounding the estimates.
…
… The procedure given in this paper uses a computer or a hand calculator and is more objective. Moreover, a specific stress-strain curve is given that works very well in a computer program for calculating the edgewise compressive strength of corrugated fiberboard …
…
THE CALCULATOR CORNER
Stress-strain relation for paperboard in edgewise compression
Program for SR-52 calculator
This program is useful to papermakers for analyzing the edgewise compressive behavior of paperboard. It determines the coefficients to a formula that characterizes the stress-strain relation of paperboard tested in edgewise compression. The Forest Products Laboratory uses the results of this program to calculate the theoretical effects of different paperboards on corrugated box top-to-bottom compressive strength.
BEST!
SlideRule
ABSTRACT
One of the most important properties of paperboard is characterized by the analogue plot of stress vs. strain obtained from an edgewise compression loading test. A method is given for determining the average stress-strain curve for a group of curves by the use of representative models. An approximate method also allows data to be read from a stress-strain curve so the analysis can be performed with a hand calculator.
…
… A method for analyzing continuous trace data (curves) is presented in this paper. To do this the curve is reduced to a two-parameter model. Individual fits between the model and each trace are characterized by the parameter estimates obtained from a regression analysis. Ultimately it is possible to obtain a single pair of parameter estimates representative of all the traces. The accuracy of the results is represented by a confidence region surrounding the estimates.
…
… The procedure given in this paper uses a computer or a hand calculator and is more objective. Moreover, a specific stress-strain curve is given that works very well in a computer program for calculating the edgewise compressive strength of corrugated fiberboard …
…
THE CALCULATOR CORNER
Stress-strain relation for paperboard in edgewise compression
Program for SR-52 calculator
This program is useful to papermakers for analyzing the edgewise compressive behavior of paperboard. It determines the coefficients to a formula that characterizes the stress-strain relation of paperboard tested in edgewise compression. The Forest Products Laboratory uses the results of this program to calculate the theoretical effects of different paperboards on corrugated box top-to-bottom compressive strength.
BEST!
SlideRule