Add FunctionMaterialLogic and FunctionMaterialUpdateStrategy, run function material "Show diagram".

StructureHelperLogics/Models/Materials/Logics/FunctionMaterialLogic.cs

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+using LoaderCalculator.Data.Materials;
+using StructureHelperCommon.Infrastructures.Enums;
+using StructureHelperCommon.Models.Materials.Libraries;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.Models.Materials.Logics
+{
+    internal class FunctionMaterialLogic : IFunctionMaterialLogic
+    {
+        private List<double> parameters;
+        public IMaterial GetLoaderMaterial(IFunctionMaterial functionMaterial, LimitStates limitState, CalcTerms calcTerm, double factor = 1d)
+        {
+            IMaterial material = new Material();
+            /*material.InitModulus = functionMaterial.Modulus;
+            IFactorLogic factorLogic = new FactorLogic(functionMaterial.SafetyFactors);
+            var factors = factorLogic.GetTotalFactor(limitState, calcTerm);
+            parameters = new List<double>()
+            {
+                functionMaterial.Modulus,
+                functionMaterial.CompressiveStrength * factors.Compressive * factor,
+                functionMaterial.TensileStrength * factors.Tensile * factor
+            };
+            material.DiagramParameters = parameters;
+            material.Diagram = GetStressByStrain;*/
+            return material;
+        }
+        private double GetStressByStrain(IEnumerable<double> parameters1, double strain)
+        {
+            double modulus = parameters.First();
+            double stress = modulus * strain;
+            double compressiveStrength = (-1d) * parameters.ElementAt(1);
+            double tensileStrength = parameters.ElementAt(2);
+            if (stress > tensileStrength || stress < compressiveStrength) { return 0d; }
+            else { return stress; }
+        }
+    }
+}