January 28, 2021 at 5:59 pmkhokon_sazzalSubscriberHi, I am simulating fatigue loading on a spring steel (55si7 or AISI 55S7) specimen in Ansys. But due to proper material properties, specially S-N curve, I am unable to do it.n
February 8, 2021 at 3:59 pmGovindan NagappanAnsys Employee@khokon_sazzal nIf you have access to the Granta Selector product, you can search the database for the material properties. I do see several different materials show up on a quick searchnIf you do not have access to Granta, you may have to check with your supplier for the material propertiesn
February 10, 2021 at 4:27 pmDaniel ShawAnsys EmployeeObtaining S-N curves can be difficult. Ansys provides some in Mechanical and some in Granta. Otherwise, the user must obtain them. You may need to contact a material supplier to to obtain them.n
February 25, 2021 at 4:37 pmramgopisettiSubscriberYou can construct an therotical SN curve if you have the Ultimate tensile strength of your material. the ordinates of that curve will be as followsnFor an four point curve( mostly helpful)nat 0 Cycle = SUTnat 1E3 Cycle = n x SUT where n =0.8 and changes based on Manufacturing ( refer to shigley textbook)nat 1E6 Cycle = 0.5 x SUT for SUT <= 1400MPa or 700 MPa if less than 1400MPa nand at infinte cucle it just continues .n use the followign python script to visulise the plot nimport matplotlib.pyplot as pltnimport numpy as npnfrom scipy.interpolate import interp1dnSUT=650nSYT=510nSE=118.4ndef sn(SUT,SYT,R,a,m):n plt.subplot(2, 1, 1)n X=np.array([0,1E3, 1E6,1E7] )n Y=np.array([SUT, 0.8*SUT, 0.5*SUT, 0.5*SUT])n plt.xlabel(Cycles)n plt.ylabel(Strength (MPa))n plt.grid()n plt.plot(X,Y)n plt.subplot(2, 1, 2)n X1 = np.array([SYT, 0])n X2 = np.array([SUT, 0])n Y1 = np.array([0, SYT])n Y2 = np.array([0, 0.5*SUT])n plt.plot(X1, Y1, label='Yield Line')n plt.plot(X2, Y2, label='Modified GoodMan')n yu = R * X2n plt.plot(X2, yu, label='Ratio=%f' % (R))n plt.axis([0, SUT, 0, SYT])n plt.hlines(y=a,xmin=0,xmax=m)n plt.vlines(x=m,ymin=0,ymax=a)n plt.xlabel(Mean stress (MPa))n plt.ylabel(Alternating Stress (MPa))n plt.legend(loc='upper right')nn plt.show()nThis is theroy,you can extend this idea as you want and fit your results.
April 21, 2021 at 9:57 amDavid MercierAnsys EmployeeJust to add a comment about material data in Granta Selector. You can have access to S-N curves, at least to fatigue strength model like given below for a low alloy steel, in the database MaterialUniverse which gives access to generic material datasheets. In such datasheet, the fatigue stregth model, displayed as an S-N curve on the datasheet, shows the highest cyclic stress amplitude the material can survive, when the stress is repeatedly applied and relaxed (or reversed) for a given number of cycles.nnn
- The topic ‘Looking for Spring steel (55Si7) library material’ is closed to new replies.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Adding New Material
- Exothermal reaction kinetics
- Fatigue SN curve
- Curve Fitting – “Error Norm to Fit” expression
- material designer
- Ansys Granta Selector license problem
- Anyone experience in how to model a glass filled polyamide (Nylon)
- Strain Life Parameter
- Multistack layer model
- adding new material in Granta
© 2023 Copyright ANSYS, Inc. All rights reserved.