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Locate your sample stress-strain data file and click Open.Ģ.

To create a stress-strain graph in Excel, first gather your data:ġ. The line that best describes the data points represents the Johnson cook parameter.

A stress-strain graph plots the stress (in MPa) against the strain (in %) over time. One way to find Johnson Cook parameters is to use a stress-strain graph. This can be due to variations in the stress-strain data, or physical properties that are not easily describable using linear elasticity theory. See  for details.Sometimes it is difficult to determine the Johnson Cook parameters for a material. If a student wishes to buy a personal subscription, which will not be funded by the University, Graphpad offer a reduced price for student subscriptions from their website. GraphPad Prism Subscriptions for use on students' personal machines can be purchased from the university account so long as the use of a University budget has been authorised by the budget holder. The price and instructions for requesting a subscripition are given in the "University Owned Machines" section above. For example, if you wish to use Prism on a campus-based desktop, and also on a laptop at home, you will need to purchase two subscriptions. Each machine on which Prism is to be used will require a separate subscription. Subscriptions for GraphPad Prism can be purchased for use on personal machines. To request a subscription for Prism, please raise a service request using the following request type:Ī self-service request can be logged at .uk You can purchase a Prism subscription at any time during the year but will be charged the full £35 + VAT cost, regardless of how long remains until the subscription expiry date. Key features of the Prism subscription are: The subscription is specific to a particular machine only it can be used by anyone with access to that machine, but cannot be moved between machines. Prism is available on an annual subscription. GraphPad Prism, available for both Windows and Mac computers, combines scientific graphing, comprehensive curve fitting (nonlinear regression), understandable statistics, and data organisation.

Statistical Analysis Software Licence: GraphPad Prism