Although the PFEM was originally designed for fluid dynamics and FSI applications, the method is a powerful tool also for non-linear solid mechanics. In this field, PFEM is particularly useful for those processes where solid bodies undergo large motions and deformations, as it occurs in several manufacturing processes and many geotechnical applications. In this field, the PFEM has shown the capability to track accurately the deforming shape of the solid material and to deal with the complex interactions between the different solid bodies.
Pressing a quarter of a metal cylinder 
Orthogonal cutting test of a steel workpiece. Continous chip formation considering a deformable tool 
The first PFEM formulation for solid mechanics  was applied to complex industrial processes, such as metal forging, machining, or powder filling. Different types of manufacturing processes are studied in ,  analyzed tunneling and excavation applications, while bed erosion in river dynamics was tackled in . Several PFEM formulations have been proposed in the field of soil mechanics and geotechnical engineering, especially for the modeling of frictional materials and granular flows  and for different types of geomechanics problems . A more extended literature review of the PFEM formulations for solid mechanics can be found in .
3D machining done by a rigid tool generating a continous chip from a metal piece 
One of the most critical points of PFEM for solid mechanics is the management and conservation of the historical variables during the remeshing step. The solution accuracy depends on how well the historical information is preserved along with the transition from the previous mesh to the new one. This remapping procedure may lead to smooth the historical solution. This problem has been extensively studied in the PFEM literature. To limit the solution smoothing, Oliver et al.  proposed to remap not the whole historical variable but just its time step increment. For the same purpose,  proposed to transfer the information directly from the Gauss points of the previous mesh to those of the new mesh in those zones where the connectivity has not changed. Recently,  proposed to use nodal integration rather than the Gaussian one to improve the preservation of historical variables. In nodal integration schemes, all variables (including stresses and strains) are stored at the nodes. Hence, this information is not erased during the remeshing and is not affected by the remapping procedure.
The capability of the PFEM for dealing with contact interaction between solids was proved since the first applications of the method to non-linear solid mechanics problems. The first study that showed its suitability for contact problems was . In this work, the authors studied FSI problems where the solid bodies, dragged by the fluid motion, could impact each other and against the rigid contours.
The PFEM contact algorithm uses a mesh of interlayer elements between the boundaries of the interacting solid bodies. This auxiliary mesh is created following the same steps of the standard PFEM remeshing procedure described before. The contact elements that pass the Alpha-Shape check are furtherly reduced by considering for computation only those elements having a size smaller than a fixed critical value. Over these active contact elements, the elastic and frictional forces are computed either with penalty methods or using Lagrangian multipliers .
Machining by a rigid tool generating a segmental chip from a metal piece 
The contact algorithm was improved in  by applying an artificial contraction to the solid boundaries to capture more accurately the contact time and to reduce the distance between the interacting solid bodies. The same methodology was also used in the so-called Contact Domain Method  and formalized in . The first 3D application of the PFEM contact algorithm was presented in , where the capabilities of the method were proved against complex multi-body interactions, either in the presence of water or not.
Cylindrical steel bar impacting with a wall 
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