Last edited by Daigul
Friday, August 7, 2020 | History

3 edition of Fitting a hyperbolic sine curve to creep data found in the catalog.

Fitting a hyperbolic sine curve to creep data

by Max Shiffman

  • 169 Want to read
  • 37 Currently reading

Published by Courant Institute of Mathematical Sciences, New York University in New York .
Written in English


Edition Notes

Statementby Max Shiffman and Bernard Friedman.
ContributionsFriedman, Bernard
The Physical Object
Pagination7 p.
ID Numbers
Open LibraryOL17983322M

  The three variables I need to adjust are qi (initial oil production and it will be >= the qi in the data), b (ranging from to ) and Di (nominal decline which can range from 1 to %). I know I could do this using a tripple for loop and vary Qi, b, and Di and use whatever combination yields the smallest r-squared total but I'm sure that. The raw data is listed in Table A.3 and is plotted in Figure Data Analysis. Figure Power-law fit to bulk SnAg compression creep data. We were not able to fit the compression data to a hyperbolic sine model, thus the data was fit to a simpler power law model.

Abstract. A uniaxial constitutive equation-set for commercial precipitation-strengthened alloys, consisting of a hyperbolic sine law kinetic creep equation and several microstructure-evolution (damage-rate) equations, has been described. If i plot this data choosing n= 5 and letting T vary from 1 to i get the following curve: Where the blue curve is my real data and the Stack Exchange Network Stack Exchange network consists of Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build.

  This creep law is applicable to materials that exhibit an insignificant primary creep region and is defined by three distinct parts: the secondary creep rate, the creep rupture strain, and the creep rupture time. The secondary creep rate was modeled using a hyperbolic-sine law of the following form. University of Tennessee, Knoxville Trace: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School A Study of Indentation Creep Using the Finite.


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Fitting a hyperbolic sine curve to creep data by Max Shiffman Download PDF EPUB FB2

Excerpt from Fitting a Hyperbolic Sine Curve to Creep Data In this memorandum other possible procedures for deter mining a, b are developed which are valid in any case where the hyperbolic sine law is applicable, and are easily handled numerically. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic : Max Shiffman.

Fitting a hyperbolic sine curve to creep data [Shiffman, Max, Friedman, Bernard] on *FREE* shipping on qualifying offers. Fitting a hyperbolic sine curve to creep data. Summary This paper demonstrates how to fit a hyperbolic sine curve to a set of experimental data.

A least squares solution leads to a of transcendental equations. These arc solved by iteration. An example is worked out which shows how closoly this law fits the data taken from the Creep Rate Book. Figure Plot of SAC creep data and isothermal lines of first-order SAC creep model.

The raw data and isothermal lines of the hyperbolic sine model are plotted in Figure Figures 27 and 28 suggest that, to a first order, the simplified SAC creep model provides for a reasonable fit of the data somewhat independent of the SAC alloy composition. The trick, with hyperbolic functions as well as any other type of curve-fitting, is to linearize the equation, or make it look like the equation of a straight line.

Then you can easily spot the terms that look like the slope and intercept, and use the functions to get the coefficients necessary to fit the curve. The material constants used in hyperbolic-sine creep model for stainless steel were calculated due to the models proposed and experimental data in the temperature range from K to K.

The relationships between material constants of stainless steel creep model and temperature were obtained by curve fitting. (25) for impression creep and Eq. (1) without the elastic term for tensile creep shows u, _ o-i,P (26) 16 V E- (27) 21 7ca Therefore it is possible to obtain the hyperbolic sine constitutive equation from the impression creep data, provided that the impression velocity also varies with the hyperbolic sine function of punching stress.

Figure 9: Curve-fitting of bulk SnAg tensile creep data to hyperbolic sine model. Centerline is a plot of versus where is given by equation (28).

In an attempt to consolidate the data in Figure 8, the creep rates are fitted to a hyperbolic sine model. The material constants used in hyperbolic-sine creep model for stainless steel were calculated due to the models proposed and experimental data in the temperature range from K to K.

The power law and sine hyperbolic components of theta projection approach satisfactorily captures all the regions of the creep curve. is termed as Power sine hyperbolic theta approach: (6) ε c = ε t-ε 0 = θ 1 ∗ t θ 2 + θ 3 ∗ s i n h (e θ 4 t-1) In the present study, Eqs, are used to represent the creep curves.

Model validation. An online curve-fitting solution making it easy to quickly perform a curve fit using various fit methods, make predictions, export results to Excel,PDF,Word and PowerPoint, perform a custom fit through a user defined equation and share results online.

Hyperbolic Curve Fitting Equation. creep due to the relatively large fraction of creep life within this regime. The importance of steady-state is evidenced by the empirical Monkman–Grant relationship [35]: e_m00 ss t f ¼ k MG ð4Þ where t f is the time to rupture and k MG is a constant.

A hyperbolic sine (sinh) function is often used to describe the transition from PL to PLB. Hyperbolic functions show up in many real-life situations. For example, they are related to the curve one traces out when chasing an object that is moving linearly.

They also define the shape of a chain being held by its endpoints and are used to design arches that will provide stability to structures.

The hyperbolic functions take a real argument called a hyperbolic size of a hyperbolic angle is twice the area of its hyperbolic hyperbolic functions may be defined in terms of the legs of a right triangle covering this sector.

In complex analysis, the hyperbolic functions arise as the imaginary parts of sine and hyperbolic sine and the hyperbolic cosine are. Background Info (just what is nonlinear curve-fitting, anyway?).

Simple linear curve fitting deals with functions that are linear in the parameters, even though they may be nonlinear in the example, a parabola y=a+b*x+c*x*x is a nonlinear function of x (because of the x-squared term), but fitting a parabola to a set of data is a relatively simple linear curve-fitting problem.

Curve and Surface Fitting. Curve fitting is one of the most powerful and most widely used analysis tools in Origin. Curve fitting examines the relationship between one or more predictors (independent variables) and a response variable (dependent variable), with the goal of defining a "best fit.

oretical reasons for picking a function of a certain form. The curve fit finds the specific coefficients which make that function match your data as closely as possible.

You cannot use curve fitting to find which of thousands of functions fit a data set. People also use curve fitting to merely show a smoot h curve through their data. Hyperbolic Tangent Curve Fitting Excel Reviews: You want to buy Hyperbolic Tangent Curve Fitting Excel.

2D curve-fitting is a method that converts the image data (pixel values) to a set of mathematical equations that are used to represent the image.

most commonly used to represent or. Creep behavior is specified by the equivalent uniaxial behavior—the creep “law.” In practical cases creep laws are typically of very complex form to fit experimental data; therefore, the laws are defined with user subroutine CREEP, as discussed atively, two common creep laws are provided in ABAQUS/Standard: the power law and the hyperbolic-sine law models.

A multiaxial creep theory is presented in this paper which will predict the total deformations of a load-carrying member at any specified time after load.

Load-deformation relations are derived based on the assumption that the isochronous stress-strain diagram of the material can be represented by an arc hyperbolic sine function [see, eq (2)].The stress-strain-time relations for the material were represented by a family of isochronous stress-strain curves.

For analytical purpose, each curve was approximated by an arc hyperbolic sine function. Experimental data were obtained from eight plates made of high-density polyethylene tested in a controlled-atmosphere room.The fits are marked as “PL3” and “PL12, while the model using hyperbolic sine is marked “SH” in what follows.

Individual creep curves An example of model creep curves fitted on experimental data for Ni%Cr solid solution is depicted in figure 2. It is clear that it .