Material Properties and Impact Insulation Technical Information

Transcription

1 Material Propertie and Impact Inulation Technical Information Sylodamp an overview Sylodamp i a high-damping polyurethane elatomer that ha been pecially developed to aborb the load caued by impact. Sylodamp can alo be employed a an elatic component in conventional vibration inulation application in which, in addition to permanent elaticity, a high level of damping of the elatomer i required. Typical application can be found in ituation where machinery, building tructure, technical equipment or even people need to be protected. The following beneit have been identiied in the area of impact and vibration inulation: Reduce the load caued by impact Reduce impact-induced tructure-borne noie Reduce reonance phenomena Damping of component or tructure Rapid decay of vibration In mot cae, Sylodamp i employed a a preuried pring, the material propertie of which can be ideally adapted to the application in hand by the careful choice of material type, contact area and elatomer thickne. The Sylodamp range cover the following tatic range of ue: The tatic range of ue i the maximum compreive tre deined for tationary load at which the elatic propertie of an elatomer are permanently retained. The material type refer to the compreive hardne at 0 % deformation. Thi i an individually deined meaure for the load-bearing property of an elatomer, but doe not give any information on the behavior during longterm loading. For example, the compreive hardne of Sylodamp 00 i 00 kn/m. Vibration inulation with Sylodamp Vibration inulation ue the principle of ma force compenation to reduce the propagation of mechanical vibration caued by external force or excitation. The principle area of application of Sylomer and Sylodyn material i in conventional vibration inulation. Uing Sylodamp enable even higher level of vibration inulation to be achieved, epecially when the impulive load or trong reonance phenomena that typically occur when machinery i being tarted up or hut down are preent. In addition to the preence of Sylodamp bedding, a combination of Sylodamp and Sylomer pring can alo be ued in parallel. Vibration damping with Sylodamp Vibration damping i undertood to be the converion of kinetic energy into another form of (renewable) energy that no longer ha any impact on the vibration ytem. Due to it high level of material damping, Sylodamp i a particularly effective way of keeping the reonance phenomena occurring in component or tructure within the required tolerance Speciic load in N/mm Fig. : Sylodamp range

2 Impact inulation with Sylodamp Impact inulation i a pecial type of vibration inulation that i ued to reduce the propagation of the force generated by impact. Here, a brief exciting force with a relatively high peak force i converted into a longer lating ground force with a lower peak value. The material damping feature of Sylodamp reult in the rapid damping of kinetic parameter, reducing the decay time of component and tructure. m v Sylodamp d Example of impact Fig. to 4 illutrate ome example of impact in which a ma m collide with a tructure at a velocity v. The high-damping vibration inulator made from Sylodamp i hown in orange. Fig. 3: Horizontal impact ma moving horizontally d m v Sylodamp m Fig. 4: Oblique impact ma moving at an angle h Sylodamp v d m = Ma of the moving body v = Impact velocity of the moving ma d = Thickne of the elatomer = Maximum deformation of the elatomer h = Free-fall drop height Fig. : Vertical impact free-falling ma

3 Degree of inulation The impact-inulating effect introduced by the ue of elatic bedding can be decribed by the degree of inulation I. Thi i deined a the reduction in the maximum repone loading in an intallation with elatic bedding compared to one without: Material election There are two way of electing the mot uitable material for impact application: Computational model (inite element method) Uing diagram howing the energy aborption of Sylodamp I F max, 0 F max F max, 0 I = Degree of inulation in % F max, 0 = Maximum value of the propagated ground force without elatic bedding F max = Maximum value of the propagated ground force with elatic bedding Finite element method model For traightforward impact application, Getzner ha developed a computational FEM model. The material and impact modelling make ue of drop tet tand invetigation with high-damping Sylodamp material and impactor with impact velocitie of up to 5 m/. An FEM impact imulation allow the mot uitable material deign from the Sylodamp range to be elected for the application. Principle of the conervation of energy The principle of the conervation of energy form the bai for the election of the appropriate material for an impact application. Thi equate the mechanical impact energy E kin (kinetic energy) with the deformation energy E def (energy aborption) of the high-damping Sylodamp material: m v E kin E kin E def 3 E kin = Impact energy (kinetic energy) in J E def = Deformation energy (energy aborption) in J Input parameter for the FEM imulation The following input parameter for the impact imulation mut be known: Ma of the moving body Impact velocity of the body The covering of the elatomer urface to be truck by the impactor Required elatomer thickne Reult of the FEM imulation An FEM impact imulation calculate the following reult: Plot againt time of ground force, elatomer deformation, energy aborption and/or brake delay during the impact Maximum propagated ground force Maximum deformation of the elatomer Maximum brake delay 3

4 Reult of FEM impact imulation Fig. 5 to 8 how the reult of a typical FEM impact imulation with Sylodamp. Force in kn Maximum ground force Fmax Delection in mm Maximum delection max.5 Recovery Delection Time in Fig. 5: Impact imulation plot againt time of ground force Time in Fig. 6: Impact imulation plot againt time of deformation Speed in m/ Impact velocity v Reveral point at max Energy aborption in J Maximum energy aborption -0.5 Recovery Time in Time in Fig. 7: Impact imulation plot againt time of velocity of ma Fig. 8: Impact imulation plot againt time of energy aborption 4

5 Energy aborption of Sylodamp A an alternative to FEM imulation, the choice of the mot uitable Sylodamp material for traightforward impact application can alo be made uing the following diagram (Fig. 9 to ). Speciic energy aborption in mj/mm Speciic energy aborption in mj/mm Linear compreion in % Linear compreion in % Fig. 9: Energy aborption of Sylodamp thickne.5 mm Fig. 0: Energy aborption of Sylodamp thickne 5 mm Speciic energy aborption in mj/mm Speciic energy aborption in mj/mm Linear compreion in % Linear compreion in % Fig. : Energy aborption of Sylodamp thickne 37.5 mm Fig. : Energy aborption of Sylodamp thickne 50 mm The impact energy exerted on the elatomer urface i ued a an input parameter when chooing the mot uitable material deign. The impact velocity ha no igniicant effect on the peciic energy aborption of Sylodamp. The peciic energy capacitie hown in the diagram can be ued for impact velocitie of between 0.5 m/ and 5 m/. 5

6 Ideal deformation range A correponding deformation path mut be provided for the elatomer o that Sylodamp can provide the bet poible aborption of impact load. We recommend the following linear compreion igure when uing Sylodamp in impact application: Material type Ideal deformation range Sylodamp 0 40 % to 60 % Sylodamp % to 60 % Sylodamp % to 55 % Sylodamp % to 50 % Sylodamp % to 45 % Sylodamp % to 40 % Impact force propagation The aim of impact inulation i to diipate the kinetic energy of the impactor with minimum level of force over a long a period a poible. The maximum force propagated during an ideal elatic impact can be determined from the deformation energy E def and the deformation path : 4 F max, 0 E def F max, 0 = Maximum value of propagated ground force in N E def = Deformation energy (energy aborption) in J = Deformation path in m Tab. : Recommended deformation range of Sylodamp under impact loading The peciied deformation range of the individual Sylodamp product reult in the energy aborption hown below for the repective elatomer thickne value: In cae where Sylodamp i being ued a the impactinulating element, the kinetic energy of the impactor i converted not jut by an elatic proce, but by damping (diipation) a well, further reducing the maximum propagated impact force. The maximum propagated force in the above cenario can be etimated a follow: Material type Energy aborption Thickne.5 mm 5 mm 37.5 mm 50 mm Sylodamp to to.8.6 to.9.3 to 3.9 Sylodamp 30.4 to.7.6 to to to Sylodamp to to to 9 4 to 5 Sylodamp to to 30 4 to 40 8 to 46 5 F max, 0,5 E def F max, 0 = Maximum value of propagated ground force with elatic Sylodamp bedding in N E def = Deformation energy (energy aborption) in J = Deformation path in m Sylodamp to to 50 4 to 7 56 to 9 Sylodamp to 4 45 to to 8 0 to 8 Tab. : Recommended peciic energy aborption in mj/mm of Sylodamp 6

7 The elatic portion of the elatomer provide oft cuhioning of the impactor, wherea the diipative portion enure that after the impact the bulk of the energy i no longer available to the ytem a kinetic energy. Due to the high level of material damping provided by Sylodamp, the impactor only rebound very lightly following the impact. The impact reilience of Sylodamp i around 5 %, which mean that 85 % of the kinetic energy of the impactor i diipated on impact. Input parameter Ma m = 80 kg Impact velocity v = m/ Impact area A = 5,65 mm (5 mm 5 mm) Calculation of impact force for an elatic Sylodamp bedding Impact energy E kin = m v = 80 = 60 J Deformation energy E Def = E Kin = 60 J Speciic energy aborption E Def, A = E def A = = 0.4 mj/mm Elatomer Sylodamp 00/5 (a per Fig. 0) Linear compreion ɛ = 50 % (a per Fig. 0) Max. deformation = ɛ Material thickne = 50 % 5 mm =.5 mm Max. impact force with elatic bedding F max, 0.5 E Def = = 9. kn Calculation of impact force without elatic bedding with the aumption of an elatic impact with uboil reilience of 0.5 mm Reilience of uboil/max. deformation = 0.5 mm Max. impact force without elatic bedding F max, 0 = Impact-inulating effect of elatic bedding E Def = 60 = 640 kn Degree of inulation I = F max, 0 F max F max, 0 = = 97 % Tab. 3: Sample calculation for a impact iulation with Sylodamp 7

8 Getzner Werktoffe GmbH Herrenau Bür Autria T F info.buer@getzner.com Getzner Werktoffe GmbH Am Borigturm 3507 Berlin Germany T F info.berlin@getzner.com Getzner Werktoffe GmbH Nördliche Münchner Str. 7a 803 Grünwald Germany T F info.munich@getzner.com Getzner Spring Solution GmbH Gottlob-Grotz-Str. 743 Bietigheim-Biingen Germany T F info.tuttgart@getzner.com Getzner France S.A.S. Bâtiment Quadrille 9 Rue Jacqueline Auriol Lyon France T info.lyon@getzner.com Getzner Werktoffe GmbH Middle Eat Regional Office Abdul - Hameed Sharaf Str. 4 Rimawi Center - Shmeiani P. O. Box 9694 Amman 96, Jordan T F info.amman@getzner.com Getzner India Pvt. Ltd. t Floor, Kaivalya 4 Teja Society, Kothrud Pune 4038, India T F info.pune@getzner.com Nihon Getzner K.K. 6-8 Nihonbahi Odenma-cho Chuo-ku, Tokyo 03-00, Japan T F info.tokyo@getzner.com Getzner Material (Beijing) Co., Ltd. No. 905, Tower D, the Vantone Center No. Jia 6, Chaowai Street, Chaoyang Ditrict 000, Beijing, the P.R.C. T F info.beijing@getzner.com Getzner USA, Inc. 870 Red Oak Boulevard, Suite 400 Charlotte, NC 87, USA T info.charlotte@getzner.com DB WS en Copyright by Getzner Werktoffe GmbH l Subject to change without notice.