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Introduction PEEK is one of thermoplastic polymer that can be used for composite materials.
Experimental Materials.
Savage, Studies on the reprocessability of poly(ether ether ketone) (PEEK), Journal of Materials Processing Technology 214 (2014) 75– 80
Zheng, Effect of fiber surface state on mechanical properties of C f /Si–O–C composites, Materials Science and Engineering A 407 (2005) 245–249 [7] T.
LUAN, Interfacial Properties Modification of Carbon Fiber/ Polyarylacetylene Composites, Chinese Journal of Aeronautics 20(2007) 124-128 [9] X.

Preface International Conference on Semiconductor Materials and Technology (ICoSeMT 2019) was an inaugural event organized by Institute of Nano Optoelectronics Research and Technology (INOR), Universiti Sains Malaysia (USM) in conjunction with the 50th Anniversary of USM.
The event has shed some lights via the joint organization with Universiti Teknologi MARA, Cawangan Pulau Pinang (UiTM), and Collaborative Research in Engineering, Science & Technology (CREST) with the Theme “Innovation Towards A Sustainable Tomorrow”.
ICoSeMT 2019 has covered recent developments in the following topics: Optical and Electronic Materials • Narrow and Wide Band Gap Semiconductors • Diamond, Graphene, and Carbon Nanotubes • Piezoelectric and Ferroelectric Materials • Electroluminescent Materials • Colour-Changing Materials • Energy Storage Materials • Dielectric Materials • Porous Structures • Nanostructures • Superconductors Organic and Polymeric Materials • Organic Semiconductors • Conductive Polymers • Polymer Electronics and Coatings • Polymer Catalysts and Characterization • Composite Polymers and Biopolymers • Functional Polymers and Polymer Hybrid Materials Devices • Optoelectronics • Sensors and Actuators • Power & Electronic Devices • Novel Devices • Photovoltaics • MEMS/NEMS • Contacts and Interconnects • Fabrication Processes • Integrated System Design • Modelling and Simulation Packaging Technology • Phosphor Technology • Lens and Optics • Thermal Management
• Front End Assembly Processes • Back End Processes and Applications • Failure Analysis and Reliability This journal issue contains selected papers from ICoSeMT2019 which are divided into 4 chapters.
We hope that this can offers readers and opportunity to access the recent advancements and developments for current and future directions of research especially in the fields of optical and electronic materials, devices, organic and polymeric materials and packaging technology.

By creating a moving local hot spot around the contact point between tool and sheet, process forces can be reduced while forming limits are increased for most materials.
This makes these materials very suitable for HS-ISF.
Journal material forming, (2008) 1199-1202 [6] J.R.
Duflou, High-Speed Single Point Incremental Forming of an automotive aluminium alloy, Key Engineering Materials, 622-623(2014) 433-439 [10] G.
Journal of Mechanical Science and Technology, 25 (2011) 177-182 [11] X.

As is shown in Fig. 1, the workpiece materials were in the form of four 16 mm thick plates clamped in the straight slots peripherally and uniformly.
Braghini: Journal of Materials Processing Technology Vol. 159(2) (2005), p. 240-248 [5] E.
Çiçek: Materials and Manufacturing Processes Vol. 24(4) (2009), p. 476-483 [6] J.
Ai: International Journal of Machining and Machinability of Materials Vol. 1 (2006), p. 277-286 [7] J.
Zhou: International Journal of Refractory Metals and Hard Materials Vol. 28(3) (2010), p. 330-337

Cement and other raw materials (class F fly ash, coconut fiber, sand and water) were obtained locally.
Compressive test: A compression test determines behavior of materials under crushing loads.
Fly ash cement based structural materials, International Journal of Cement Composites and Lightweight Concrete, 9(4), 225-228
Cement-bonded composite boards made from poplar strands, Construction and Building Materials, 26, 131-134
Composite cement reinforced coconut fiber: Physical and mechanical properties and fracture behavior, Australian Journal of Basic and Applied Sciences, 5(7), 1228-1240

In addition to penetrating homogeneous materials (e.g. metal target), shaped charge can also be used to penetrate heterogeneous materials such as rock mass [10,11].
Science Technology and Engineering. 8(2008) 4251-4257
Journal of Beijing Institute of Technology. 20(2000) 171-173
Chinese Journal of Computational Mechanics. 22(2005) 55-58
Journal of China University of Science and Technology. 28(1998) 200-204

Coating and substrate materials were homogeneous.
Z.Suo and J.W.Hutchinson, International Journal of Fracture, 43(1990) p.1-18 2.
H.C.Cao and A.G.Evans, Mechanics of Materials, 7(1989) p.298-304 4.
J.G.Williams, Composites Science and Technology 35(1989) p.367-376 6.
C.F.Shih and R.J.Asaro, Journal of Applied Mechanics, 55(1988) p.299-316

Therefore, the damage of materials can be simulated by the connect bond’s breakage between units.
DEM method can dispose the procedure of materials’ crack formation and propagation intuitively.
(Journal of Inorganic Materials), 2010, 25(12): 1286-1290
Journal of the European Ceramic Society, 2009, 29(6): 1029-1037
Journal of the Mechanics and Physics of Solids, 1998, 46: 2103-2138

The workpiece and tooling were considered as plastic and rigid materials, respectively.
Ni, Materials & Design. 31 (2010) 1953-1961
Bakhshi-Jooybari, Journal of Materials Processing Technology. 125 (2002) 369-374
Altan, Journal of Materials Processing Technology. 189 (2007) 36-44
Lu, Materials and Design. 32 (2011) 198-206

In addition to the mentioned researches, Lannucci, Willows [3] and Tita et al, performed some numerical analyses by using a material model which can demonstrate the reduction in the properties of composite materials.
Impact on laminated composite materials.
“An energy based damage mechanics approach to modeling impact onto woven composite materials: part II.
Applied Science and Manufacturing, Vol. 38, pp. 540–554
Journal of Mechanical Engineering Science, Vol. 208(C2), pp. 113-137