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Dynamic Analysis of Selected Firing Mechanisms of Firearms
Mešina, Matej ; Hadaš, Zdeněk (referee) ; Slažanský, Martin (advisor)
This bachelor thesis strives to evaluate the dynamic analysis of firing mechanisms of different types of firearms. In the present research is analyzed the matter of firearms and ammunitions, followed by the description of distribution of firearm mechanisms, as well as the detailed scrutiny of the initiation mechanism. The thesis also marginally explores the testing of primers. The last part of the research documents the possible solutions for the analyzed issues. The practical part of the thesis is devoted to the geometry of firing mechanisms, followed by the description of the physical principles, which are relevant to this matter. Based on the analysis, a theoretical calculation of the initiation energies for all of the analyzed types of firearms is established. Lastly, the calculation of the initiation energy is calculated, and the security in secure firing of the bullet's primer is determined.
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Computer simulations of biaxial tension tests of soft biological tissues
Slažanský, Martin ; Návrat, Tomáš (referee) ; Polzer, Stanislav (advisor)
Within the master thesis a computational model of biaxial tension test of soft biological tissues was developed. The tested specimen can be attached using clamps or hooks. The number and the size of clamps and hooks have a significant impact on the distribution of stress and strain in the centre of the specimen, where deformation is measured. Using the developed computational model, a sensitivity analysis of number and size of clamps and hooks and a sensitivity analysis of placement of clamps was elaborated. The number and size of clamps and hooks were optimized in such a way that the material’s parameters obtained by the tension test correspond to the utmost to the actual parameters of the material. By analyzing the placement of clamps, the influence of selected deviations on the outcome of the tension test was determined. Finally, a plan of the next course of action has been proposed.
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Deriving and Application of Analytical Design of Hammerspring in Firearms
Vobejda, Radek ; Polzer, Stanislav (referee) ; Slažanský, Martin (advisor)
The thesis deals with inference of analytic relations for calculation of pressure helical coil spring and considerates usage possibilities of simplified relations. In the thesis there is introduced analytic computation of slightly curvatured rod theory completed by finite element method calculations. The thesis describes two springs of firearm, which weren’t able to achieve required functionality. After this there was created a plan of concept particular spring on the base of derivated relations, which should be able to meet operative conditions.
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Analysis of conformity assessment procedure of a hammer
Úlehlová, Eva ; Slažanský, Martin (referee) ; Harčarík, Matej (advisor)
This bachelor thesis deals with the analysis of the conformity assessment procedure of a hammer with its specification. The work is focused on a revolver hammer and was developed in cooperation with a company producing revolvers. In addition to describing and analyzing the hammer’s specification and conformity assessment procedure, the aim of the work was also to propose improvements. The theoretical part deals with the principles for prescribing the required product geometry on technical drawings. The output of the thesis is a proposal to improve the specification and a proposal to modify the conformity assessment procedure.
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Definition of principal material directions in the abdominal aortic aneurysms
Bartoňová, Petra ; Slažanský, Martin (referee) ; Polzer, Stanislav (advisor)
This bachelor thesis deals with definitions of principal material directions in idealized geometrical models. The theoretical part is particularly focused on general information of vascular system and abdominal aortic aneurysms in the field of anatomy, histology and surgery, afterwards it is concentrated on the biomechanical point of view. Consequently, the created algorithm is described and used to compare different definitions of principal directions considering the maximum principal stress. In conclusion, the results of FEM analyses are evaluated with respect to further study of this issue.
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Stress-Strain Analysis of Shotgun Barells
Běhal, Josef ; Majer, Zdeněk (referee) ; Slažanský, Martin (advisor)
This bachelor’s thesis deals with stress-strain analysis of the shotgun barells. Gun was designed by company Česká zbrojovka a.s. Thesis contains an introduction to the functionality of weapons folowed by chapter dealing with shot from small shot shotgun. Stress-strain analysis was performed by finite element method. The final section shows the evaluation of achieved results.
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Stress-Strain Calculations of Selected Components of Firearm
Pavlík, Ondřej ; Ševeček, Oldřich (referee) ; Slažanský, Martin (advisor)
Thesis deals with the utilization of the finite element method (FEM) in development of computational model. Subject of the computational model is the slide stop pin of the pistol CZ 75, designed and manufactured in Czech Republic by Česká zbrojovka Uherský Brod. The computational model describes strain stress analysis of the slide stop pin. The results of the analysis are subject to difficult sourcing of relevant and reliable input information. Based on stress strain analysis results, the safety factor of the pin was determined. However, the results are influenced a lot by input parameters selection. At the conclusion the summary of proposed further steps for computational model accuracy increase is proposed.
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ANALYSIS OF IMPACT OF EXPERIMENT REALISATION ON MECHANICAL CHARACTERISTICS OF BIOMATERIALS
Slažanský, Martin ; Petruška, Jindřich (referee) ; Horný,, Lukáš (referee) ; Burša, Jiří (advisor)
Dizertační práce se zabývá věrohodností mechanického testování měkkých biologických tkání a predikčními schopnostmi různých modelů materiálů. Obě oblasti byly zkoumány užitím metody konečných prvků. První část práce je věnována úvodu do problému a popisu měkkých biologických tkání, které s problémem souvisí, a rešerši nynějšího způsobu jejich mechanického testování. Druhá část práce se zabývá hledáním optimálního nastavení experimentálního zařízení za použití počítačového modelování pomocí virtuální simulace mechanických testů. Výsledky analýzy potvrdily, že dvě úzké svorky po délce hrany, stejně jako běžně používané háčky, jsou použitelné pro dvouosé tahové zkoušky různých měkkých tkání za použití čtvercového vzorku. Použití svorek je proto časově úsporná, jednoduchá a spolehlivá alternativa, která není podřadná použití háčků. V práci byla rovněž provedena analýza, jejímž výsledkem jsou doporučení ohledně typu, počtu a velikosti uchycení pro různě velké vzorky. Třetí část práce zkoumá predikční schopnosti modelů materiálů měkkých tkání a závislosti těchto schopností. Lze shrnout, že výsledné mechanické chování proloženého modelu materiálu závisí na počátečních parametrech a že neexistují „ideální“ počáteční parametry při prokládání experimentálních dat. Navzdory absenci „ideálních“ počátečních parametrů je navržen v rámci možností nejefektivnější způsob aproximace experimentálních dat z mnoha jejich souborů. Dále je možné shrnout, že omezení hodnot parametrů modelu při prokládání experimentálních dat ústí v nepředvídatelný vliv na kvalitu aproximace. V závěrečné části práce byl analyzován předpoklad afinní a neafinní deformace modelů materiálů za účelem vysvětlení velkých rozporů mezi výsledky strukturně založených modelů a výsledky dvouosých testů při různých testovacích protokolech. Ačkoli byly zjištěny určité rozdíly mezi výsledky analyzovaných modelů, přece nebyly dostatečně významné, aby vysvětlily výše uvedené velké rozpory. V poslední části práce jsou zmíněny další možné oblasti výzkumu.
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Analysis of conformity assessment procedure of a trigger
Antes, Jiří ; Slažanský, Martin (referee) ; Harčarík, Matej (advisor)
This bachelor thesis deals with the analysis of a trigger’s specification and the process of its conformity assessment procedure. The aims of the work were the analysis of specification, the analysis of conformity assessment procedure, and recommendation of possible improvements. The results of the work is a modified specification of the trigger and a proposal of improvements of the conformity assessment procedure. The work was created in collaboration with company which produces revolvers and other firearms
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Dynamic Analysis of Selected Firing Mechanisms of Firearms
Hussliková, Veronika ; Hadaš, Zdeněk (referee) ; Slažanský, Martin (advisor)
Bachelor thesis engages in analysis of firing mechanisms of chosen firearms. In introductory part of the thesis, there is a research made which involves gun problems, theoretical basis of gun theory is summarized and detailed description of firing mechanism of some types of guns is given. Alternatives of solution of the set assignment are analyzed at the end of the theoretical introduction. Practical part of the thesis deals with firing mechanisms’ analysis of four different types of firearms and subsequently with theoretical calculation of initiation energy and impact speed of the firing pin. This calculation is in conclusion applied on some specific guns. Final output is the determination of initiation energy, impact speed of the firing pin and safety in safe firing of the bullet's primer.
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