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Metal/Composite Hybrids for Lightweight Applications

100%

Osiecki T. , Nossol P. , Czech A. , Kroll L. , Niesłony A. , Łagoda T.

tom z. 106

In fields of mechanical engineering, automotive and aircraft industry the increasing demands for efficient energy processes induce the development of load adjusted multi-material constructions. In particular – due to their higher stiffness, good impact behavior and high load capacity – hybrid structures made of fiber reinforced thermoplastics (FRP) and metals can provide a significant contribution for weight reduction and thus for saving natural resources. Compared to establish thermosetting systems like GLARE, ARALL and CARALL in aircraft the new hybrid material is predestined for automotive mass production because of the short cycle times by using thermoplastic polymers.

Utilization of Eco-Friendly Rice Husk Ash Waste as Reinforcement in LDPE Thermoplastics

88%

Ginting E. M. , Motlan , Sani R. A. , Bukit N. , Bukit B. F.

tom Vol. 24, iss. 8

240--246

The topic of environmental contamination is currently regarded as one of the most urgent and significant challenges in contemporary society. Several strategies must be implemented to mitigate the environmental impact caused by waste materials, such as to rice husks ash, plastic, and other materials. Low-density polyethylene is widely recognized in academic circles for its distinctive property of having a low melting point and demonstrating inferior thermal stability. However, the utilization of RHA has promise for augmenting the thermal LDPE. The inclusion of silica inside rice husk ash functions as a flame retardant, hence augmenting the material’s capacity to resist combustion and thermal degradation. The objective of this study is to utilization of eco-friendly RHA waste as reinforcement in LDPE thermoplastics. RHA is produced by the coprecipitation process. Rheomixer is used to make thermoplastic composites by incorporate RHA into LDPE 0, 2, 4, 6, 8, and 10 wt.%. The micrograph of the failure surface of the composite material consisting of LDPE filled with reactive hot-melt adhesive RHA particles reveals significant variations in particle sizes. In adittion XRD graph showed a decrease in intensity when 6% wt and 8% wt RHA were added. The results of thermal analysis with DSC showed an increase in the melting point of the sample with RHA reinforcement from 108.96–109.21°C and 482.47–500.09°C. The incorporation of RHA as a reinforcement in LDPE holds promise for its utilization as a material possessing favorable thermal characteristics suitable for industrial applications such as pipes and protective coatings, which required enhanced thermal resistance. The utilization of rice husk ash (RHA) waste imposes both environmental and economic impacts. RHA has the potential to reduce environmental pollution caused by waste and decrease the costs involved in material production.

Non-destructive testing of thermoplastic carbon composite structures

63%

Szymański R.

2020

tom Nr 1 (258)

34--52

The article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon preimpregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn.

Artykuł wpisuje się we współczesne zainteresowania firm z branży lotniczej. Opisuje materiały oraz techniki inspekcji stosowane we wiodących firmach lotniczych. Przybliżono tematykę badań nieniszczących obecnie stosowanych w do inspekcji lotniczych struktur kompozytowych oraz krótko opisano każdą ze stosowanych metod. Przedstawiono również charakterystykę preimpregnatów węglowych w osnowie termoplastycznej oraz wymieniono rodzaje materiałów termoplastycznych i przykładowe zastosowanie ich w konstrukcji statków powierzchnych. Wymieniono wady, zalety oraz ograniczenia dla tych materiałów. Skoncentrowano się na wyjaśnieniu metody ultradźwiękowej, która jest najpowszechniej stosowaną metodą podczas kontroli struktur kompozytowych na etapie produkcyjnym oraz eksploatacyjnym. Opisując metodę ultradźwiękową skupiono się na technice puls echo i zastosowaniu nowoczesnych głowic wieloprzetwornikowych (Phased Array). Wymieniono i opisano niezgodności najczęściej występujące i wykrywane w materiałach kompozytowych z osnową termoutwardzalną oraz termoplastyczną. Opisano termoplastyczny płaski panel kompozytowy wykonany z preimpregnatu węglowego w osnowie wysokotemperaturowej (ponad 300°C), który stanowił obiekt badania. Zaprezentowano wyniki badań nieniszczących (metodą ultradźwiękową) panelu termoplastycznego i wyciągnięto wnioski.