delete functions in solid particle

[Xiangyu-Hu]

SPHinXsys/src/shared/particles/solid_particles.h

Lines 90 to 131 in ea091de

	/** Return the Lagrange strain. */
	Matd getGreenLagrangeStrain(size_t particle_i);
	/** Computing principal strain - returns the principal strains in descending order (starting from the largest) */
	Vecd getPrincipalStrains(size_t particle_i);
	/** Computing von Mises equivalent strain from a static (constant) formulation. */
	Real getVonMisesStrain(size_t particle_i);
	/** Computing von Mises equivalent strain from a "dynamic" formulation. This depends on the Poisson's ratio (from commercial FEM software Help). */
	Real getVonMisesStrainDynamic(size_t particle_i, Real poisson);
	/** Computing von Mises strain for all particles. - "static" or "dynamic"*/
	StdLargeVec<Real> getVonMisesStrainVector(std::string strain_measure = "static");
	/** Computing maximum von Mises strain from all particles. - "static" or "dynamic" */
	Real getVonMisesStrainMax(std::string strain_measure = "static");
	/** Return the max principal strain. */
	Real getPrincipalStrainMax();
	/** get the Cauchy stress. */
	Matd getStressCauchy(size_t particle_i);
	/** get the PK2 stress. */
	Matd getStressPK2(size_t particle_i);
	/** Computing principal_stresses - returns the principal stresses in descending order (starting from the largest) */
	Vecd getPrincipalStresses(size_t particle_i);
	/** Computing von_Mises_stress - "Cauchy" or "PK2" decided based on the stress_measure_ */
	Real getVonMisesStress(size_t particle_i);
	/** Computing von Mises stress for all particles. - "Cauchy" or "PK2" decided based on the stress_measure_ */
	StdLargeVec<Real> getVonMisesStressVector();
	/** Computing maximum von Mises stress from all particles. - "Cauchy" or "PK2" decided based on the stress_measure_ */
	Real getVonMisesStressMax();
	Real getPrincipalStressMax();
	/** Computing displacement. */
	Vecd displacement(size_t particle_i);
	/** Return the displacement. */
	StdLargeVec<Vecd> getDisplacement();
	/** get the max displacement. */
	Real getMaxDisplacement();
	/**< Computing normal vector. */
	Vecd normal(size_t particle_i);
	/** get the normal vector. */
	StdLargeVec<Vecd> getNormal();
	/** relevant stress measure */
	std::string stress_measure_;

In order to achieve separation between particle class from physical method classes, I am going to clean all particles so that at last only base particles left. For this, I need to clean all functions in particles classes.

@BenceVirtonomy @FabienPean-Virtonomy Could you help to move these functions out, or I can delete if they are not useful anymore?

[FabienPean-Virtonomy]

In order to achieve separation between particle class from physical method classes, I am going to clean all particles so that at last only base particles left. For this, I need to clean all functions in particles classes.

I agree that they should be free functions, they can be cut out of the ElasticSOlidParticles class