INFORME TÉCNICO Ensayo de Compresión Solicitante : Ing. Paredes Paredes Jaramillo Víctor Fecha de presentación : 25/09/205
1.
ANTECEDENTES Se ad!"irió dos latas de at#n $ dos de leche% llenas $ &acías' para ser sometidas al ensa$o de compresión.
2.
GENE ENERALI RALIDA DADE DES S DE DE LA M MES EST TRA (ipo de madera )am*as m"estras+: tornillo. ,-"estra : atas de leche )"na llena $ otra &acía+ imensiones: ,-"estra 2: atas de at#n )"na llena $ otra &acía+ imensiones:
!.
O"#ETI$OS DEL ENSA% SA%O
&.
DEL MATERIAL
a madera Tornillo pro&iene de "na r*ol recto $ cilíndrico !"e tiene "na alt"ra de 25 m )"so comercial+ a 10 m' con "n dimetro de m' la madera consiste de pe!"eos t"*os disp"estos &erticalmente en el tronco' !"e transportan ag"a $ los minerales' es por ello !"e al cortar el tronco en paralelo a s" e3e' la madera tiene &etas rectas. Sin em*argo' 4n alg"nos r*oles' los cond"ctos estn disp"estos de orma helicoidal' es decir' enrollados alrededor del e3e del tronco' "n corte de este tronco tr onco prod"cir madera con &etas cr"6adas. 4l (ornillo es "na madera medianamente pesada' presenta contracciones lineales media $ contracción &ol"m7trica esta*le $ la resistencia mecnica se sit#a en el límite de la categoría categoría media' asimismo' asimismo' presenta presenta "na s"stancia s"stancia
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d"ra $ resistente' se ha "tili6ado como material de constr"cción de &i&iendas' "sad "sada a en piso pisos' s' estr estr"c "ct" t"ra rass de casa casa'' arma armad" d"ra ras' s' &iga &igas' s' carp carpin inte terí ría a de interiores' artesanía $ en la a*ricación de p"ertas' &entanas $ carrocerías. Características
8olor: 4l tronco presenta las capas eternas )al*"ra+ de color rosado $ las capas internas )d"ramen+ "n ro3i6o claro' entre las capas "n grad"al contraste de color. (et"ra: r"esa. ;rillo: -oderado a ;rillante Veteado: Veteado: &isi*le a simple &ista' en promedio < anillos en "n radio de 2'5 cm =lor: el pol&illo aecta las &ías respiratorias. Propiedades Físicas
ensidad:
0'1 > 0'? g/cm<
8ontracción &ol"m7trica:
<'9 > 0'@5 A
Belación (/B:
2'2
8ontracción (angencial:
< > ?A
8ontracción Badial:
> <'?A
Propiedades Mecánicas
-od"lo de elasticidad elasticidad de leión: leión: 99 > 0C (m /cm2 -od"lo de r"pt"ra en leión:
5?@ > @9< Dg /cm 2
8omprensión paralela:
220 > 1< Dg /cm 2
8omprensión perpendic"lar:
5? > @@ Dg /cm 2
8orte paralelo a las i*ras:
C0 > C? Dg /cm2
"re6a de los lados:
< >
De'e()os In)o*era+*es •
Peror Peroraci acione oness grande grandes' s' como como ag"3ero ag"3eross de insect insectos os con con dimet dimetros ros ma$ores a
•
Ba3ad"ras $ grietas !"e atra&iesen el espesor de madera
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•
-adera con signos de presencia de insectos acti&os
•
P"treacción
,.
DEFIN EFINIC ICIO ION NES -A -ARA EL EL ENS ENSA A%O - Módulo de Rotura: medida de la mima capacidad resistente !"e tiene
la pro*eta para soportar "na carga en orma grad"al d"rante "n período corto de tiempo. 4s "n criterio de resistencia aceptado m"ndialmente' a#n c"ando no corresponde a "na tensión real' de*ido a !"e la órm"la con la c"al se determina solamente es &lida en la 6ona elstica. - Módulo de Elasticidad: medida de la resistencia a la deormación aial
de la pro*eta c"ando se la somete a "na carga de dirección paralela a las i*ras de la madera. Se determina como la pendiente de la 6ona lin lineal eal del gr gric ico o carga arga>d >de eor ormac mación ión por por de*a e*a3o del lími límite te de proporcionalidad. 4n el caso del ensa$o de leión' se relaciona con la deleión de*ido al ci6alle o es"er6o de corte
.
LIST LISTA A DE E/I E/I-O -OS S % MA MAT TERIA ERIALE LES S •
M0ina Ams*er para Ensayo de Tra((ión y F*e3ión
-!" -!"in ina a Emsle mslerr para para 4nsa 4nsa$o $o de (racc racció ión n 4 es "na "na m!" m!"in ina a "ni& "ni&er ersa sall medidora del es"er6o de tracción' con el c"al tam*i7n se p"ede reali6ar ensa$ ensa$os os de leió leión n o do*lad do*lado' o' compre compresió sión n de di&ers di&ersos os materi materiale ales. s. 4sta 4sta m!"ina posee "n "ncionamiento electrohidr"lico.
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Esquema de la máquina universal AMSLER para ensayos de tracción.
. Besorte Besorte de <000g. <000g. Gtili6ad Gtili6ado o para para el ensa$ ensa$o. o. 2. 8arrete 8arrete ! aecta aecta el graico graico "er6a "er6a )carga+ )carga+ &ers"s &ers"s alarga alargamient miento. o. <. -ord -orda6 a6a a S"pe S"perio riorr. 1. 8art"las 8art"las con las ag"3as ag"3as negras negras $ ro3as ro3as 5. -"estra. @. -ord -orda6 a6a a iner inerio iorr. ?. Vl& Vl&"l "la a de desc descar arga ga.. C. Pin Pin de de -or -orda da6a 6a.. 9. Palanca Palanca de a3"ste a3"ste de la m"est m"estra ra de la morda6a morda6a inerior inerior.. 0.Palanca para desa3"star el pin $ despla6ar la morda6a inerior para m"estras largas. . . Plomada !"e hace girar girar el carrete. 2.Vl&"la de carga. <.-otor.
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•
$ernier
Se "til "tili6 i6ó ó para para medi medirr las las dime dimens nsio ione ness de las las lata latass de lech leche e $ at#n at#n de secciones circ"lares antes del ensa$o.
•
•
Ma)eria* de ensayo
Re*o5 Comparador
Gn relo3 comparado comparadorr o comparado comparadorr es "n instr"mento de medición medición !"e se "tili6a para comparar cotas mediante la medición indirecta del indirecta del despla6amiento de "na p"nta p"nta de contacto es7rica es7rica c"ando el aparato est i3o en "n soporte' soporte' permiten o*tener medidas con "na precisión de precisión de cent7simas.
Soportes de base man!tica para comparado
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
6. COND CONDIC ICIO IONE NES S DEL DEL ENSA ENSA% %O a norma "tili6ada para la reali6ación del ensa$o son: ASTM 0 0@K.
as condiciones a tomar en c"enta son las ! a contin"ación presentamos. •
Rapide7 de* ensayo
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
Traducción:
$e*o(idad de -re+a 9.5. a carga se aplicar de orma contin"a a lo largo del ensa$o a "na &elocidad "niorme de mo&imiento de la cr"ceta mó&il de la m!"ina de ensa$o' se calc"la de ac"erdo con 4! .
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
onde: H L &elocidad de mo&imiento de la ca*e6a en mo&imiento' in. /min )mm / min+' 6 L tasa "nitaria de deormación de la i*ra' p"lg./p"lg. )mm / mm+ de i*ra eterior longit"d por min"to )L 0'005+' LSpan' p"lg. )mm+ d L pro"ndidad )espesor+ de la m"estra' en. )mm+. H=(E < ;asada en la ec"ación ' la tasa calc"lada de ascendencia ca*e6a es: 0'2 p"lg. / -in )< mm / min+ m in+ d"rante /1 p"lg. )@ mm+ de espesor' 0'21 p"lg. / -in )@ mm / min+ m in+ para /2 p"lg. )2 mm+ de espesor' 0'<@ p"lg. / -in )9 mm / min+ m in+ para 1 p"lg. )9 mm+ de espesor' 0'1C p"lg. / -in )2 mm / min+ d"rante p"lg. )25 mm+ de espesor. Bepla6ando datos. L100mm dL25mm
[email protected]< mm/min
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
8.
-ROCEDIMIENTO Se"n norma ASTM-# $%&'
4l m7todo consiste en aplicar "na carga contin"a' a &elocidad constante' en la mita mitad d de la l"6 l"6 de la pro* pro*et eta' a' midi midien endo do las las deo deorm rmac acio ione ness prod"cidas por la aplicación de dicha carga hasta llegar al p"nto de rot"ra. Span )as"mido para am*as pro*etas+ L 00 cm a. Prim Primer ero o se toma toma "na de las m"est m"estra rass )m"est )m"estra ra + $ se proc proced ede ea encontrar la mitad de s" longit"d mima con a$"da de "na Oincha' para !"e en esta act#e el p"n6ón' de*e tenerse en c"enta !"e el p"n6ón act"ara por el ancho de la &iga de madera. *. Se coloca coloca la madera madera en los los apo$os apo$os ! estn estn so*re so*re el soporte soporte de de acero acero !"e hacer a la &e6 de regla para poder medir la distancia entre apo$os de la madera.
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
c. Se empie empie6a 6a a real reali6 i6ar ar el ensa ensa$$o con con la &eloc elocid idad ad !"e !"e indi indica ca la norm norma a ES(S(- >1 >1<' <' la c"al c"al nos nos dice dice !"e !"e para para n"es n"estr tra a made madera ra !"e tiene "na sección no ma$or de 5050 se "tili6a "na &elocidad de @.5< mm/min.
d. 8on esta esta primera primera &iga leion leionada ada se calc"la calc"lara ra la mima mima carga carga para l"ego pasar a calc"lar s" mód"lo de o"ng.
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
e. a teniendo teniendo la mima mima carga carga hallada hallada en la primera primera m"estra m"estra se pasa a hallar las deleiones hasta el @0A de la mima carga en la m"estra 2' primero 9 p"ntos de 0.0 en 0.0 mm para l"ego @ p"ntos #ltimos de 0.05 en 0.05 mm. Edems para cada p"nto p"nto hallado se de*e medir medir s" carga correspondiente.
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
9.
C:L C:LCLOS % RESLTADOS
atos de lecha $ carga "eron tomando en el la*oratorio d"rante el ensa$o.
De'*e3ión ;mm< @.@1 @.@2 @.@! @.@& @.@, @.@ @.@6 @.@8 @.@9 @.1 @.1, @.2 @.2,
Car=a ;>=< 1 @ 9 2 1 @ 2 21 2? 50 C0 0
8arga de rot"ra' P L C0Dg
Momen)o ;>=?m< 0.25 .5 2.25 < <.5 1 5.25 @ @.?5 2.5 20 2?.5
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
E+ 4s"er6o de rot"ra por leión. leión.
QL
Q L 2 201 0C.@<< Dg/m2 L 2.@2 -Pa
;+ -ód"lo -ód"lo de elasticida elasticidad d eperimen eperimental tal
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
1@. CONCLSIONES
E partir de la grica de 8arga VS eleión se p"ede concl"ir !"e prcticamente la deleión o lecha encontrada dependía linealmente conorme se a"menta*a la carga.
el p"nto anterior se e&idencia "n comportamiento linealmente elstico.
Eparentemente se p"ede concl"ir !"e la alla )rot"ra+ de la madera llegó en el estado elstico.
os res"ltados o*tenidos no serían tan conia*les $a !"e pres"mimos !"e la madera "tili6ada "e pre&iamente atigada )o*ser&ado al momento de la compra de dicho material+' adems de las condiciones de tra*a3o e&idenciados en los dos apo$os d"rante el ensa$o de leión.
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
12. ANEOS
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales 0uente: *orporación Maderera 0ER1ES2 S.A.*.
333.rupo)erpesi.com.pe
A-LICACIONES DE LOS ENSA%OS ENSA%OS MEC:NICOS DE FLEIN4 TRACCIN % COM-RESIN
ARRFO ARRFO % /E"RANT /E"RANTO O EN LA $IGA?"/E.? $IGA?"/E.? Si la s"pericie del mar est"&iera comp"esta por "na serie de olas estndar $ el *"!"e ataca las olas perpendic"larmente a la línea de s"s crestas' al na&egar podr encontrarse en ininitas posiciones con respecto a tales olas. e esas posiciones' las !"e interesan' por ser las ms desa&ora*les' son
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
MÉNSL MÉNSLA AS.? soportan leión de*ido al momento !"e le pro&oca la carga !"e se le aplica en orma &ertical.
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales
CA"LES4 TIRANTES O TENSORES.? Se "tili6an en constr"cciones de gran resistencia $ peso red"cido. 4st constit"ida por ca*les o tirantes
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GHIV4BSIE HE8I=HE 4 IH4HI4BE Fac"ltad de ingeniería mecnica a*oratorio de Besistencia de -ateriales